diff --git a/docker-compose.yml b/docker-compose.yml
index df094e5e..4a16eb32 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -1,7 +1,10 @@
 services:
   frontend:
     image: wechatopenai/weknora-ui:latest
-    build: ./frontend
+    build:
+      context: ./frontend
+      args:
+        - MAX_FILE_SIZE_MB=${MAX_FILE_SIZE_MB:-50}
     container_name: WeKnora-frontend
     ports:
       - "${FRONTEND_PORT:-80}:80"
diff --git a/frontend/Dockerfile b/frontend/Dockerfile
index 6ecb5d36..73341a6f 100644
--- a/frontend/Dockerfile
+++ b/frontend/Dockerfile
@@ -7,6 +7,10 @@ WORKDIR /app
 ENV NODE_OPTIONS="--max-old-space-size=4096"
 ENV VITE_IS_DOCKER=true
 
+# 文件大小限制(MB)，通过构建参数传入
+ARG MAX_FILE_SIZE_MB=50
+ENV VITE_MAX_FILE_SIZE_MB=${MAX_FILE_SIZE_MB}
+
 # 复制依赖文件
 COPY package*.json ./
 COPY packages/xlsx-0.20.2.tgz ./packages/xlsx-0.20.2.tgz
diff --git a/frontend/src/utils/index.ts b/frontend/src/utils/index.ts
index 181cd6b9..db9389bc 100644
--- a/frontend/src/utils/index.ts
+++ b/frontend/src/utils/index.ts
@@ -1,4 +1,9 @@
 import { MessagePlugin } from "tdesign-vue-next";
+
+// 从环境变量获取最大文件大小(MB)，默认30MB
+const MAX_FILE_SIZE_MB = Number(import.meta.env.VITE_MAX_FILE_SIZE_MB) || 50;
+const MAX_FILE_SIZE_BYTES = MAX_FILE_SIZE_MB * 1024 * 1024;
+
 export function generateRandomString(length: number) {
   let result = "";
   const characters =
@@ -33,16 +38,16 @@ export function kbFileTypeVerification(file: any, silent = false) {
   }
   if (
     (type == "pdf" || type == "docx" || type == "doc") &&
-    file.size > 31457280
+    file.size > MAX_FILE_SIZE_BYTES
   ) {
     if (!silent) {
-      MessagePlugin.error("pdf/doc文件不能超过30M！");
+      MessagePlugin.error(`pdf/doc文件不能超过${MAX_FILE_SIZE_MB}M！`);
     }
     return true;
   }
-  if ((type == "txt" || type == "md") && file.size > 31457280) {
+  if ((type == "txt" || type == "md") && file.size > MAX_FILE_SIZE_BYTES) {
     if (!silent) {
-      MessagePlugin.error("txt/md文件不能超过30M！");
+      MessagePlugin.error(`txt/md文件不能超过${MAX_FILE_SIZE_MB}M！`);
     }
     return true;
   }