diff --git a/backend/src/main/java/com/designhub/service/TaskService.java b/backend/src/main/java/com/designhub/service/TaskService.java
index 346d2b6..45db4dd 100644
--- a/backend/src/main/java/com/designhub/service/TaskService.java
+++ b/backend/src/main/java/com/designhub/service/TaskService.java
@@ -116,6 +116,11 @@ public class TaskService {
         
         // 如果是一级需求部门发起的任务，设置相关字段
         if (isPrimaryTask) {
+            // 一级需求部门发起任务必须上传预览图
+            if (task.getPreviewImage() == null || task.getPreviewImage().trim().isEmpty()) {
+                throw new BusinessException(ResultCode.PARAM_ERROR, "一级需求部门发起任务必须上传预览图");
+            }
+            
             task.setIsPrimaryTask(1);
             task.setPrimaryPublisherId(task.getPublisherId());
             task.setPrimaryPublisherDeptId(task.getPublisherDeptId());
@@ -294,6 +299,11 @@ public class TaskService {
         // 检查一级需求部门是否可以跳过任务明细
         boolean canSkipTaskDetail = false;
         if (isPrimaryTask) {
+            // 一级需求部门发起任务必须上传预览图
+            if (dto.getPreviewImage() == null || dto.getPreviewImage().trim().isEmpty()) {
+                throw new BusinessException(ResultCode.PARAM_ERROR, "一级需求部门发起任务必须上传预览图");
+            }
+            
             Boolean canFillDetail = systemConfigService.getBooleanValue("task.primary_dept_can_fill_detail", true);
             canSkipTaskDetail = !canFillDetail;
             log.info("一级需求部门流水线任务，canFillDetail={}, canSkipTaskDetail={}", canFillDetail, canSkipTaskDetail);
diff --git a/frontend/src/views/CreateTask.vue b/frontend/src/views/CreateTask.vue
index 94200f0..bd38bcb 100644
--- a/frontend/src/views/CreateTask.vue
+++ b/frontend/src/views/CreateTask.vue
@@ -430,7 +430,11 @@
             </a-form-item>
 
             <!-- 预览图上传 -->
-            <a-form-item label="预览图" name="previewImage">
+            <a-form-item 
+              label="预览图" 
+              name="previewImage"
+              :required="isPrimaryDeptUser"
+            >
               <div 
                 class="preview-upload-area"
                 @paste="handlePasteImage"
@@ -456,7 +460,11 @@
                   <span class="tip-icon">
                     <Icon name="image" size="sm" color="#31f08b" />
                   </span>
-                  <span>建议上传正方形图片，系统将自动压缩处理，显示在任务卡片上。支持 Ctrl+V 粘贴图片</span>
+                  <span v-if="isPrimaryDeptUser" style="color: #ff4d4f;">
+                    <Icon name="warning" size="xs" style="margin-right: 4px;" />
+                    一级需求部门发起任务必须上传预览图
+                  </span>
+                  <span v-else>建议上传正方形图片，系统将自动压缩处理，显示在任务卡片上。支持 Ctrl+V 粘贴图片</span>
                 </div>
               </div>
             </a-form-item>
@@ -815,7 +823,7 @@ const removeBarcode = (index: number) => {
 const handleCheckInventory = handleAddBarcode
 
 // 表单验证规则
-const formRules = {
+const formRules = computed(() => ({
   title: [
     { required: true, message: '请输入任务标题', trigger: 'blur' },
     { min: 2, max: 100, message: '标题长度在2-100个字符', trigger: 'blur' }
@@ -846,8 +854,21 @@ const formRules = {
   ],
   releaseType: [
     { required: true, message: '请选择发布类型', trigger: 'change' }
+  ],
+  previewImage: [
+    { 
+      required: isPrimaryDeptUser.value, 
+      message: '一级需求部门发起任务必须上传预览图', 
+      trigger: 'change',
+      validator: (_rule: any, value: string) => {
+        if (isPrimaryDeptUser.value && !value) {
+          return Promise.reject('一级需求部门发起任务必须上传预览图')
+        }
+        return Promise.resolve()
+      }
+    }
   ]
-}
+}))
 
 // 使用全局配置store的数据
 const taskTypes = computed(() => configStore.demandTypes)
@@ -1536,6 +1557,12 @@ const handleSubmit = async () => {
     // 验证表单
     await formRef.value.validate()
 
+    // 一级需求部门用户必须上传预览图
+    if (isPrimaryDeptUser.value && !formData.previewImage) {
+      message.error('一级需求部门发起任务必须上传预览图')
+      return
+    }
+
     // 验证任务类型（一级需求部门且关闭任务明细时跳过验证）
     const validTaskTypes = formData.taskTypes.filter(item => item.taskTypeId && item.quantity > 0)
     if (shouldShowTaskDetail.value) {