diff --git a/frontend/src/api/admin/settings.ts b/frontend/src/api/admin/settings.ts
index 4fc49de6..84848cd0 100644
--- a/frontend/src/api/admin/settings.ts
+++ b/frontend/src/api/admin/settings.ts
@@ -850,6 +850,105 @@ export async function sendTestEmail(
   return data;
 }
 
+// ==================== Email Template Settings ====================
+
+export interface EmailTemplateOption {
+  value: string;
+  label?: string;
+  description?: string;
+}
+
+export type EmailTemplateEventOption = string | EmailTemplateOption;
+
+export interface EmailTemplateSummary {
+  event: string;
+  locale: string;
+  subject: string;
+  is_custom?: boolean;
+  updated_at?: string;
+}
+
+export interface EmailTemplateListResponse {
+  events: EmailTemplateEventOption[];
+  locales: string[];
+  templates?: EmailTemplateSummary[];
+  placeholders?: string[];
+}
+
+export interface EmailTemplateDetail {
+  event: string;
+  locale: string;
+  subject: string;
+  html: string;
+  is_custom?: boolean;
+  updated_at?: string;
+  placeholders?: string[];
+}
+
+export interface UpdateEmailTemplateRequest {
+  subject: string;
+  html: string;
+}
+
+export interface PreviewEmailTemplateRequest extends UpdateEmailTemplateRequest {
+  event: string;
+  locale: string;
+}
+
+export interface EmailTemplatePreviewResponse {
+  subject: string;
+  html: string;
+}
+
+export async function getEmailTemplates(): Promise<EmailTemplateListResponse> {
+  const { data } = await apiClient.get<EmailTemplateListResponse>(
+    "/admin/settings/email-templates",
+  );
+  return data;
+}
+
+export async function getEmailTemplate(
+  event: string,
+  locale: string,
+): Promise<EmailTemplateDetail> {
+  const { data } = await apiClient.get<EmailTemplateDetail>(
+    `/admin/settings/email-templates/${encodeURIComponent(event)}/${encodeURIComponent(locale)}`,
+  );
+  return data;
+}
+
+export async function updateEmailTemplate(
+  event: string,
+  locale: string,
+  request: UpdateEmailTemplateRequest,
+): Promise<EmailTemplateDetail> {
+  const { data } = await apiClient.put<EmailTemplateDetail>(
+    `/admin/settings/email-templates/${encodeURIComponent(event)}/${encodeURIComponent(locale)}`,
+    request,
+  );
+  return data;
+}
+
+export async function restoreOfficialEmailTemplate(
+  event: string,
+  locale: string,
+): Promise<EmailTemplateDetail> {
+  const { data } = await apiClient.post<EmailTemplateDetail>(
+    `/admin/settings/email-templates/${encodeURIComponent(event)}/${encodeURIComponent(locale)}/restore-official`,
+  );
+  return data;
+}
+
+export async function previewEmailTemplate(
+  request: PreviewEmailTemplateRequest,
+): Promise<EmailTemplatePreviewResponse> {
+  const { data } = await apiClient.post<EmailTemplatePreviewResponse>(
+    "/admin/settings/email-template-preview",
+    request,
+  );
+  return data;
+}
+
 /**
  * Admin API Key status response
  */
@@ -1156,6 +1255,11 @@ export const settingsAPI = {
   updateSettings,
   testSmtpConnection,
   sendTestEmail,
+  getEmailTemplates,
+  getEmailTemplate,
+  updateEmailTemplate,
+  restoreOfficialEmailTemplate,
+  previewEmailTemplate,
   getAdminApiKey,
   regenerateAdminApiKey,
   deleteAdminApiKey,
diff --git a/frontend/src/views/admin/SettingsView.vue b/frontend/src/views/admin/SettingsView.vue
index 3f44a474..5da2d2e3 100644
--- a/frontend/src/views/admin/SettingsView.vue
+++ b/frontend/src/views/admin/SettingsView.vue
@@ -6193,6 +6193,9 @@
               </div>
             </div>
           </div>
+
+          <EmailTemplateEditor />
+
           <!-- Balance Low Notification -->
           <div class="card">
             <div
@@ -6450,6 +6453,7 @@ import Toggle from "@/components/common/Toggle.vue";
 import ProxySelector from "@/components/common/ProxySelector.vue";
 import ImageUpload from "@/components/common/ImageUpload.vue";
 import BackupSettings from "@/views/admin/BackupView.vue";
+import EmailTemplateEditor from "@/views/admin/settings/EmailTemplateEditor.vue";
 import { useClipboard } from "@/composables/useClipboard";
 import { affiliatesAPI, type AffiliateAdminEntry, type SimpleUser as AffiliateSimpleUser } from "@/api/admin/affiliates";
 import { extractApiErrorMessage, extractI18nErrorMessage } from "@/utils/apiError";
diff --git a/frontend/src/views/admin/settings/EmailTemplateEditor.vue b/frontend/src/views/admin/settings/EmailTemplateEditor.vue
new file mode 100644
index 00000000..30a5e4f6
--- /dev/null
+++ b/frontend/src/views/admin/settings/EmailTemplateEditor.vue
@@ -0,0 +1,438 @@
+<template>
+  <div class="card">
+    <div
+      class="flex flex-col gap-3 border-b border-gray-100 px-6 py-4 dark:border-dark-700 lg:flex-row lg:items-start lg:justify-between"
+    >
+      <div>
+        <h2 class="text-lg font-semibold text-gray-900 dark:text-white">
+          {{ t("admin.settings.emailTemplates.title") }}
+        </h2>
+        <p class="mt-1 text-sm text-gray-500 dark:text-gray-400">
+          {{ t("admin.settings.emailTemplates.description") }}
+        </p>
+      </div>
+      <div class="flex flex-wrap gap-2">
+        <button
+          type="button"
+          class="btn btn-secondary btn-sm"
+          :disabled="loadingTemplate || previewing || !canPreview"
+          @click="refreshPreview"
+        >
+          {{ previewing ? t("admin.settings.emailTemplates.previewing") : t("admin.settings.emailTemplates.preview") }}
+        </button>
+        <button
+          type="button"
+          class="btn btn-secondary btn-sm"
+          :disabled="loadingTemplate || restoring || !selectedEvent || !selectedLocale"
+          @click="restoreOfficial"
+        >
+          {{ restoring ? t("admin.settings.emailTemplates.restoring") : t("admin.settings.emailTemplates.restoreOfficial") }}
+        </button>
+        <button
+          type="button"
+          class="btn btn-primary btn-sm"
+          :disabled="loadingTemplate || saving || !canSave"
+          @click="saveTemplate"
+        >
+          {{ saving ? t("admin.settings.emailTemplates.saving") : t("admin.settings.emailTemplates.save") }}
+        </button>
+      </div>
+    </div>
+
+    <div class="space-y-6 p-6">
+      <div
+        v-if="loadingList"
+        class="flex items-center gap-2 text-sm text-gray-500 dark:text-gray-400"
+      >
+        <span
+          class="h-4 w-4 animate-spin rounded-full border-b-2 border-primary-600"
+        ></span>
+        {{ t("common.loading") }}
+      </div>
+
+      <template v-else>
+        <div class="grid grid-cols-1 gap-4 md:grid-cols-2">
+          <div>
+            <label class="input-label" for="email-template-event">
+              {{ t("admin.settings.emailTemplates.event") }}
+            </label>
+            <select
+              id="email-template-event"
+              v-model="selectedEvent"
+              class="input"
+              :disabled="loadingTemplate || eventOptions.length === 0"
+            >
+              <option
+                v-for="option in eventOptions"
+                :key="option.value"
+                :value="option.value"
+              >
+                {{ option.label || option.value }}
+              </option>
+            </select>
+            <p v-if="selectedEventDescription" class="input-hint">
+              {{ selectedEventDescription }}
+            </p>
+          </div>
+          <div>
+            <label class="input-label" for="email-template-locale">
+              {{ t("admin.settings.emailTemplates.locale") }}
+            </label>
+            <select
+              id="email-template-locale"
+              v-model="selectedLocale"
+              class="input"
+              :disabled="loadingTemplate || localeOptions.length === 0"
+            >
+              <option
+                v-for="localeOption in localeOptions"
+                :key="localeOption"
+                :value="localeOption"
+              >
+                {{ formatLocale(localeOption) }}
+              </option>
+            </select>
+          </div>
+        </div>
+
+        <div
+          v-if="!eventOptions.length || !localeOptions.length"
+          class="rounded-lg border border-amber-200 bg-amber-50 p-4 text-sm text-amber-700 dark:border-amber-800 dark:bg-amber-900/20 dark:text-amber-300"
+        >
+          {{ t("admin.settings.emailTemplates.empty") }}
+        </div>
+
+        <div v-else class="grid grid-cols-1 gap-6 xl:grid-cols-2">
+          <div class="space-y-4">
+            <div>
+              <label class="input-label" for="email-template-subject">
+                {{ t("admin.settings.emailTemplates.subject") }}
+              </label>
+              <input
+                id="email-template-subject"
+                v-model="subject"
+                type="text"
+                class="input"
+                :disabled="loadingTemplate"
+                :placeholder="t('admin.settings.emailTemplates.subjectPlaceholder')"
+              />
+            </div>
+
+            <div>
+              <label class="input-label" for="email-template-html">
+                {{ t("admin.settings.emailTemplates.html") }}
+              </label>
+              <textarea
+                id="email-template-html"
+                v-model="html"
+                rows="18"
+                class="input min-h-[28rem] resize-y font-mono text-sm leading-6"
+                :disabled="loadingTemplate"
+                :placeholder="t('admin.settings.emailTemplates.htmlPlaceholder')"
+              ></textarea>
+            </div>
+
+            <div
+              class="rounded-lg border border-gray-200 bg-gray-50 p-4 dark:border-dark-700 dark:bg-dark-800/60"
+            >
+              <div class="text-sm font-medium text-gray-900 dark:text-white">
+                {{ t("admin.settings.emailTemplates.placeholders") }}
+              </div>
+              <p class="mt-1 text-xs text-gray-500 dark:text-gray-400">
+                {{ t("admin.settings.emailTemplates.placeholdersHelp") }}
+              </p>
+              <div class="mt-3 flex flex-wrap gap-2">
+                <button
+                  v-for="placeholder in placeholderList"
+                  :key="placeholder"
+                  type="button"
+                  class="rounded-full border border-gray-200 bg-white px-3 py-1 font-mono text-xs text-gray-700 transition-colors hover:border-primary-300 hover:text-primary-600 dark:border-dark-600 dark:bg-dark-700 dark:text-gray-200 dark:hover:border-primary-500 dark:hover:text-primary-300"
+                  @click="copyPlaceholder(placeholder)"
+                >
+                  {{ placeholder }}
+                </button>
+              </div>
+            </div>
+          </div>
+
+          <div class="space-y-4">
+            <div
+              class="rounded-lg border border-gray-200 bg-white dark:border-dark-700 dark:bg-dark-800"
+            >
+              <div
+                class="flex items-center justify-between border-b border-gray-100 px-4 py-3 dark:border-dark-700"
+              >
+                <div>
+                  <div class="text-sm font-medium text-gray-900 dark:text-white">
+                    {{ t("admin.settings.emailTemplates.livePreview") }}
+                  </div>
+                  <div class="mt-0.5 text-xs text-gray-500 dark:text-gray-400">
+                    {{ previewSubject || t("admin.settings.emailTemplates.noPreview") }}
+                  </div>
+                </div>
+                <span
+                  v-if="isCustomTemplate"
+                  class="rounded-full bg-primary-50 px-2.5 py-1 text-xs font-medium text-primary-700 dark:bg-primary-900/30 dark:text-primary-300"
+                >
+                  {{ t("admin.settings.emailTemplates.customized") }}
+                </span>
+              </div>
+              <div class="bg-gray-100 p-3 dark:bg-dark-900">
+                <iframe
+                  class="h-[36rem] w-full rounded-md border border-gray-200 bg-white dark:border-dark-700"
+                  sandbox=""
+                  :srcdoc="previewHtml"
+                  :title="t('admin.settings.emailTemplates.livePreview')"
+                ></iframe>
+              </div>
+            </div>
+
+            <p class="text-xs text-gray-500 dark:text-gray-400">
+              {{ t("admin.settings.emailTemplates.previewSecurityHint") }}
+            </p>
+          </div>
+        </div>
+      </template>
+    </div>
+  </div>
+</template>
+
+<script setup lang="ts">
+import { computed, onMounted, ref, watch } from "vue";
+import { useI18n } from "vue-i18n";
+import { adminAPI } from "@/api";
+import type {
+  EmailTemplateEventOption,
+  EmailTemplateOption,
+} from "@/api/admin/settings";
+import { useAppStore } from "@/stores";
+import { extractApiErrorMessage } from "@/utils/apiError";
+
+const { t } = useI18n();
+const appStore = useAppStore();
+
+const fallbackPlaceholders = [
+  "{{site_name}}",
+  "{{recipient_name}}",
+  "{{recipient_email}}",
+  "{{subscription_group}}",
+  "{{expiry_time}}",
+  "{{days_remaining}}",
+  "{{current_balance}}",
+  "{{threshold}}",
+  "{{recharge_url}}",
+  "{{recharge_amount}}",
+  "{{order_id}}",
+  "{{unsubscribe_url}}",
+];
+
+const loadingList = ref(true);
+const loadingTemplate = ref(false);
+const saving = ref(false);
+const previewing = ref(false);
+const restoring = ref(false);
+const eventOptions = ref<EmailTemplateOption[]>([]);
+const localeOptions = ref<string[]>([]);
+const selectedEvent = ref("");
+const selectedLocale = ref("");
+const subject = ref("");
+const html = ref("");
+const isCustomTemplate = ref(false);
+const placeholders = ref<string[]>([]);
+const previewSubject = ref("");
+const previewHtml = ref("");
+const initializingSelection = ref(false);
+
+function normalizeEventOption(option: EmailTemplateEventOption): EmailTemplateOption {
+  if (typeof option === "string") {
+    return { value: option };
+  }
+  return option;
+}
+
+const selectedEventDescription = computed(() => {
+  return (
+    eventOptions.value.find((option) => option.value === selectedEvent.value)
+      ?.description || ""
+  );
+});
+
+const placeholderList = computed(() => {
+  const combined = [...placeholders.value, ...fallbackPlaceholders];
+  return Array.from(
+    new Set(
+      combined
+        .map((item) => formatPlaceholder(item))
+        .filter((item) => item.length > 0),
+    ),
+  );
+});
+
+function formatPlaceholder(placeholder: string): string {
+  const trimmed = placeholder.trim();
+  if (!trimmed) return "";
+  if (trimmed.startsWith("{{") && trimmed.endsWith("}}")) return trimmed;
+  return `{{${trimmed}}}`;
+}
+
+const canSave = computed(
+  () =>
+    Boolean(selectedEvent.value && selectedLocale.value) &&
+    subject.value.trim().length > 0 &&
+    html.value.trim().length > 0,
+);
+
+const canPreview = computed(
+  () => Boolean(selectedEvent.value && selectedLocale.value) && html.value.trim().length > 0,
+);
+
+function formatLocale(locale: string): string {
+  const lower = locale.toLowerCase();
+  if (lower === "zh" || lower.startsWith("zh-")) {
+    return t("admin.settings.emailTemplates.localeZh");
+  }
+  if (lower === "en" || lower.startsWith("en-")) {
+    return t("admin.settings.emailTemplates.localeEn");
+  }
+  return locale;
+}
+
+function applyTemplate(template: {
+  subject: string;
+  html: string;
+  is_custom?: boolean;
+  placeholders?: string[];
+}) {
+  subject.value = template.subject;
+  html.value = template.html;
+  isCustomTemplate.value = template.is_custom === true;
+  if (template.placeholders?.length) {
+    placeholders.value = template.placeholders;
+  }
+}
+
+async function loadTemplate() {
+  if (!selectedEvent.value || !selectedLocale.value) return;
+  loadingTemplate.value = true;
+  try {
+    const template = await adminAPI.settings.getEmailTemplate(
+      selectedEvent.value,
+      selectedLocale.value,
+    );
+    applyTemplate(template);
+    await refreshPreview();
+  } catch (err: unknown) {
+    appStore.showError(extractApiErrorMessage(err, t("common.error")));
+  } finally {
+    loadingTemplate.value = false;
+  }
+}
+
+async function loadTemplateList() {
+  loadingList.value = true;
+  try {
+    const response = await adminAPI.settings.getEmailTemplates();
+    eventOptions.value = response.events.map(normalizeEventOption);
+    localeOptions.value = response.locales;
+    placeholders.value = response.placeholders || [];
+    initializingSelection.value = true;
+    selectedEvent.value = eventOptions.value[0]?.value || "";
+    selectedLocale.value = response.locales[0] || "";
+    await loadTemplate();
+    initializingSelection.value = false;
+  } catch (err: unknown) {
+    initializingSelection.value = false;
+    appStore.showError(extractApiErrorMessage(err, t("common.error")));
+  } finally {
+    loadingList.value = false;
+  }
+}
+
+async function saveTemplate() {
+  if (!canSave.value) {
+    appStore.showError(t("admin.settings.emailTemplates.validationRequired"));
+    return;
+  }
+  saving.value = true;
+  try {
+    const template = await adminAPI.settings.updateEmailTemplate(
+      selectedEvent.value,
+      selectedLocale.value,
+      {
+        subject: subject.value,
+        html: html.value,
+      },
+    );
+    applyTemplate(template);
+    await refreshPreview();
+    appStore.showSuccess(t("admin.settings.emailTemplates.saveSuccess"));
+  } catch (err: unknown) {
+    appStore.showError(extractApiErrorMessage(err, t("common.error")));
+  } finally {
+    saving.value = false;
+  }
+}
+
+async function refreshPreview() {
+  if (!canPreview.value) {
+    previewSubject.value = "";
+    previewHtml.value = "";
+    return;
+  }
+  previewing.value = true;
+  try {
+    const preview = await adminAPI.settings.previewEmailTemplate({
+      event: selectedEvent.value,
+      locale: selectedLocale.value,
+      subject: subject.value,
+      html: html.value,
+    });
+    previewSubject.value = preview.subject;
+    previewHtml.value = preview.html;
+  } catch (err: unknown) {
+    appStore.showError(extractApiErrorMessage(err, t("common.error")));
+  } finally {
+    previewing.value = false;
+  }
+}
+
+async function restoreOfficial() {
+  if (!selectedEvent.value || !selectedLocale.value) return;
+  if (!window.confirm(t("admin.settings.emailTemplates.restoreConfirm"))) return;
+
+  restoring.value = true;
+  try {
+    const template = await adminAPI.settings.restoreOfficialEmailTemplate(
+      selectedEvent.value,
+      selectedLocale.value,
+    );
+    applyTemplate(template);
+    await refreshPreview();
+    appStore.showSuccess(t("admin.settings.emailTemplates.restoreSuccess"));
+  } catch (err: unknown) {
+    appStore.showError(extractApiErrorMessage(err, t("common.error")));
+  } finally {
+    restoring.value = false;
+  }
+}
+
+async function copyPlaceholder(placeholder: string) {
+  try {
+    await navigator.clipboard.writeText(placeholder);
+    appStore.showSuccess(t("admin.settings.emailTemplates.placeholderCopied"));
+  } catch {
+    appStore.showError(t("common.error"));
+  }
+}
+
+watch([selectedEvent, selectedLocale], ([eventValue, localeValue], [oldEvent, oldLocale]) => {
+  if (initializingSelection.value) return;
+  if (!eventValue || !localeValue) return;
+  if (eventValue === oldEvent && localeValue === oldLocale) return;
+  void loadTemplate();
+});
+
+onMounted(() => {
+  void loadTemplateList();
+});
+</script>