diff --git a/src/components/image-editor/model3d-generation/Model3dGenerationModal.test.tsx b/src/components/image-editor/model3d-generation/Model3dGenerationModal.test.tsx
index b4b57f8e2..56d97f232 100644
--- a/src/components/image-editor/model3d-generation/Model3dGenerationModal.test.tsx
+++ b/src/components/image-editor/model3d-generation/Model3dGenerationModal.test.tsx
@@ -298,4 +298,28 @@ describe('Model3dGenerationModal', () => {
     );
     expect(onSubmit.mock.calls[0][0].model3dAttemptNonce).toBeTruthy();
   });
+
+  it('失败态下主按钮也开新一代，不会重现同一次失败', () => {
+    const onSubmit = vi.fn();
+    const failedDialog = createDialog('model3d-text-to-model', {
+      prompt: '一把木椅',
+      status: 'failed',
+      errorMessage: '3D 模型生成失败，请稍后重试。',
+    });
+    render(
+      <Model3dModalHarness initialDialog={failedDialog} onSubmit={onSubmit} />,
+    );
+
+    // 主按钮在失败态仍是「再生成一次」的自然入口，可以点；但不能沿用旧代次，
+    // 否则幂等键不变、服务端只会把原来那个终态 operation 还回来。
+    expect((submitButton() as HTMLButtonElement).disabled).toBe(false);
+    fireEvent.click(submitButton());
+
+    expect(onSubmit).toHaveBeenCalledTimes(1);
+    expect(onSubmit.mock.calls[0][0].model3dAttemptNonce).not.toBe(
+      failedDialog.model3dAttemptNonce,
+    );
+    expect(onSubmit.mock.calls[0][0].model3dAttemptNonce).toBeTruthy();
+    expect(onSubmit.mock.calls[0][0].status).toBe('idle');
+  });
 });
diff --git a/src/components/image-editor/model3d-generation/Model3dGenerationModal.tsx b/src/components/image-editor/model3d-generation/Model3dGenerationModal.tsx
index 67f9a9c74..57d8ffa5c 100644
--- a/src/components/image-editor/model3d-generation/Model3dGenerationModal.tsx
+++ b/src/components/image-editor/model3d-generation/Model3dGenerationModal.tsx
@@ -71,6 +71,11 @@ export function Model3dGenerationModal({
     hasRequiredInput &&
     !isGenerating &&
     !hasPendingImageReferenceUploads;
+  // 幂等键 = 代次 + 请求内容指纹，同键同请求只会拿回原来那个终态 operation。
+  // 所以失败态下的任何提交（主按钮或「重试」）都要开新一代，否则点下去只是重现同一次失败；
+  // 参数一改本来就会换代号次，这里补的是「不改参数直接再点一次」这条路。
+  const submitDialog =
+    dialog.status === 'failed' ? refreshModel3dAttemptNonce(dialog) : dialog;
 
   useImageCanvasFloatingOptionDismiss({
     isOpen: isImageMode && isGenerationReferenceMenuOpen,
@@ -114,7 +119,7 @@ export function Model3dGenerationModal({
           className="image-canvas-editor__generation-submit"
           disabled={!canSubmit}
           aria-label={MODEL3D_GENERATION_SUBMIT_LABEL}
-          onClick={() => onSubmit(dialog)}
+          onClick={() => onSubmit(submitDialog)}
         >
           {isGenerating ? (
             '生成中'
@@ -135,7 +140,7 @@ export function Model3dGenerationModal({
             size="xs"
             shape="pill"
             aria-label="重试生成 3D 模型"
-            onClick={() => onSubmit(refreshModel3dAttemptNonce(dialog))}
+            onClick={() => onSubmit(submitDialog)}
           >
             重试
           </PlatformActionButton>