diff --git a/frontend/admin-web/src/infrastructure/http/http.client.ts b/frontend/admin-web/src/infrastructure/http/http.client.ts
index efabfaf..009f92c 100644
--- a/frontend/admin-web/src/infrastructure/http/http.client.ts
+++ b/frontend/admin-web/src/infrastructure/http/http.client.ts
@@ -20,7 +20,7 @@ class HttpClient {
       headers: { 'Content-Type': 'application/json' },
     });
 
-    // Request 拦截器：注入 Bearer token
+    // Request 拦截器：注入 Bearer token；FormData 时删除 Content-Type 让浏览器自动带 boundary
     this.client.interceptors.request.use((config) => {
       if (typeof window !== 'undefined') {
         try {
@@ -35,6 +35,9 @@ class HttpClient {
           // ignore parse errors
         }
       }
+      if (config.data instanceof FormData) {
+        delete config.headers['Content-Type'];
+      }
       return config;
     });