diff --git a/components.d.ts b/components.d.ts
index 7c60292..71a433d 100644
--- a/components.d.ts
+++ b/components.d.ts
@@ -68,6 +68,7 @@ declare module 'vue' {
     TySidebar: typeof import('./src/components/ty-sidebar.vue')['default']
     TyTable: typeof import('./src/components/ty-table.vue')['default']
     TyTabs: typeof import('./src/components/ty-tabs.vue')['default']
+    TyTenantSwitch: typeof import('./src/components/ty-tenant-switch.vue')['default']
   }
   export interface GlobalDirectives {
     vLoading: typeof import('element-plus/es')['ElLoadingDirective']
@@ -132,4 +133,5 @@ declare global {
   const TySidebar: typeof import('./src/components/ty-sidebar.vue')['default']
   const TyTable: typeof import('./src/components/ty-table.vue')['default']
   const TyTabs: typeof import('./src/components/ty-tabs.vue')['default']
+  const TyTenantSwitch: typeof import('./src/components/ty-tenant-switch.vue')['default']
 }
\ No newline at end of file
diff --git a/src/api/auth.ts b/src/api/auth.ts
index 26a8b46..507cbe5 100644
--- a/src/api/auth.ts
+++ b/src/api/auth.ts
@@ -58,3 +58,16 @@ export interface TenantBrand {
 export function fetchBrand(signal?: AbortSignal): Promise<TenantBrand> {
   return http.get<TenantBrand>('/auth/brand', { signal })
 }
+
+export interface SwitchTenantResult {
+  accessToken: string
+  refreshToken: string
+  expiresIn: number
+  tenantCode: string
+  tenantName: string
+}
+
+/** 平台超管切换租户。 */
+export function switchTenant(tenantCode: string): Promise<SwitchTenantResult> {
+  return http.post<SwitchTenantResult>('/auth/switch-tenant', { tenantCode })
+}
diff --git a/src/components/ty-header.vue b/src/components/ty-header.vue
index 244f52d..880fa86 100644
--- a/src/components/ty-header.vue
+++ b/src/components/ty-header.vue
@@ -50,6 +50,7 @@
         <icon type="iconify" icon="mdi:cog-outline" />
       </button>
       <ty-notice />
+      <ty-tenant-switch />
       <el-dropdown trigger="click" @command="onUserCommand">
         <span class="ty-header__user">
           <icon type="iconify" icon="mdi:account-circle" />
diff --git a/src/components/ty-tenant-switch.vue b/src/components/ty-tenant-switch.vue
new file mode 100644
index 0000000..abb3d29
--- /dev/null
+++ b/src/components/ty-tenant-switch.vue
@@ -0,0 +1,64 @@
+<template>
+  <el-dropdown v-if="permissionStore.isSuper" trigger="click" @command="onCommand">
+    <button class="ty-tenant-switch" type="button" title="切换租户">
+      <icon type="iconify" icon="mdi:domain" />
+    </button>
+    <template #dropdown>
+      <el-dropdown-menu>
+        <el-dropdown-item v-for="t in tenants" :key="t.code" :command="t.code" :disabled="t.code === currentTenantCode">
+          {{ t.name }}（{{ t.code }}）
+        </el-dropdown-item>
+      </el-dropdown-menu>
+    </template>
+  </el-dropdown>
+</template>
+
+<script setup lang="ts">
+import { computed, onMounted, ref } from 'vue'
+import { useAuthStore } from '@/stores/modules/auth'
+import { usePermissionStore } from '@/stores/modules/permission'
+import { listTenants, type Tenant } from '@/api/tenant'
+
+defineOptions({ name: 'TyTenantSwitch' })
+
+const auth = useAuthStore()
+const permissionStore = usePermissionStore()
+const tenants = ref<Tenant[]>([])
+
+const currentTenantCode = computed(() => decodeTenantCode(auth.accessToken))
+
+function decodeTenantCode(token: string | null): string {
+  if (!token) return ''
+  try {
+    const payload = token.split('.')[1]
+    const base64 = payload.replace(/-/g, '+').replace(/_/g, '/').padEnd(Math.ceil(payload.length / 4) * 4, '=')
+    const bytes = Uint8Array.from(atob(base64), (c) => c.charCodeAt(0))
+    const json = JSON.parse(new TextDecoder().decode(bytes))
+    return (json.tenantCode as string) ?? ''
+  } catch {
+    return ''
+  }
+}
+
+async function onCommand(tenantCode: string): Promise<void> {
+  if (!tenantCode || tenantCode === currentTenantCode.value) return
+  await auth.switchTenant(tenantCode)
+  window.location.reload()
+}
+
+onMounted(async () => {
+  const res = await listTenants({ page: 1, pageSize: 200 })
+  tenants.value = res.list
+})
+</script>
+
+<style scoped lang="scss">
+.ty-tenant-switch {
+  @apply inline-flex items-center justify-center w-[34px] h-[34px] border-none rounded-base bg-transparent text-[18px] text-text-regular cursor-pointer transition-colors duration-200;
+
+  &:hover {
+    @apply bg-bg-page;
+    color: var(--el-color-primary);
+  }
+}
+</style>
diff --git a/src/stores/modules/auth.ts b/src/stores/modules/auth.ts
index 702df5a..3dbc03f 100644
--- a/src/stores/modules/auth.ts
+++ b/src/stores/modules/auth.ts
@@ -1,7 +1,7 @@
 import { computed, ref } from 'vue';
 import { defineStore } from 'pinia';
 import { http } from '@/api/http';
-import { fetchBrand, login as loginApi, type LoginResult, type TenantBrand } from '@/api/auth';
+import { fetchBrand, login as loginApi, switchTenant as switchTenantApi, type LoginResult, type TenantBrand } from '@/api/auth';
 import { clearTokens, getAccessToken, getMustChangePassword, getRefreshToken, setMustChangePassword, setTokens } from '@/utils/token';
 
 export const useAuthStore = defineStore('authStore', () => {
@@ -16,6 +16,16 @@ export const useAuthStore = defineStore('authStore', () => {
     brand.value = await fetchBrand();
   }
 
+  /** 平台超管切换租户：换 token 后由调用方刷新页面重建上下文。 */
+  async function switchTenant(tenantCode: string): Promise<void> {
+    const data = await switchTenantApi(tenantCode);
+    setTokens(data.accessToken, data.refreshToken);
+    accessToken.value = data.accessToken;
+    refreshToken.value = data.refreshToken;
+    mustChangePassword.value = false;
+    setMustChangePassword(false);
+  }
+
   async function login(username: string, password: string, tenantCode?: string): Promise<LoginResult> {
     const data = await loginApi(username, password, tenantCode);
     if ('accessToken' in data) {
@@ -49,5 +59,5 @@ export const useAuthStore = defineStore('authStore', () => {
     setMustChangePassword(false);
   }
 
-  return { accessToken, refreshToken, isAuthenticated, mustChangePassword, brand, login, logout, reset, fetchBrandState };
+  return { accessToken, refreshToken, isAuthenticated, mustChangePassword, brand, login, logout, reset, fetchBrandState, switchTenant };
 });