diff --git a/frontend/src/components/TaskDetailModal.tsx b/frontend/src/components/TaskDetailModal.tsx
new file mode 100644
index 0000000..765b41f
--- /dev/null
+++ b/frontend/src/components/TaskDetailModal.tsx
@@ -0,0 +1,140 @@
+import { useEffect, useState } from 'react';
+import { Modal, Descriptions, Spin, Tag, Typography, Empty } from 'antd';
+import { taskApi } from '@/api';
+import type { Task } from '@/types';
+import { TaskStatusTag, PriorityTag } from '@/components/constants';
+import dayjs from 'dayjs';
+
+const { Paragraph, Text } = Typography;
+
+interface Props {
+  taskId: number | null;
+  open: boolean;
+  onClose: () => void;
+}
+
+/** 任务详情弹窗：在 DAG 画布/项目页内点击任务卡片时弹出，不跳转页面 */
+export default function TaskDetailModal({ taskId, open, onClose }: Props) {
+  const [task, setTask] = useState<Task | null>(null);
+  const [loading, setLoading] = useState(false);
+
+  useEffect(() => {
+    if (!open || taskId == null) return;
+    setLoading(true);
+    setTask(null);
+    taskApi
+      .get(taskId)
+      .then(setTask)
+      .catch(() => setTask(null))
+      .finally(() => setLoading(false));
+  }, [open, taskId]);
+
+  const renderJsonBlock = (raw?: string) => {
+    if (!raw) return <Text type="secondary">无</Text>;
+    let pretty = raw;
+    try {
+      pretty = JSON.stringify(JSON.parse(raw), null, 2);
+    } catch {
+      /* keep raw */
+    }
+    return (
+      <pre
+        style={{
+          background: '#f6f8fa',
+          border: '1px solid #e8e8e8',
+          borderRadius: 6,
+          padding: 12,
+          maxHeight: 260,
+          overflow: 'auto',
+          fontSize: 12,
+          margin: 0,
+          whiteSpace: 'pre-wrap',
+          wordBreak: 'break-all',
+        }}
+      >
+        {pretty}
+      </pre>
+    );
+  };
+
+  return (
+    <Modal
+      title={task ? `任务 #${task.id} ${task.title}` : '任务详情'}
+      open={open}
+      onCancel={onClose}
+      footer={null}
+      width={720}
+      destroyOnClose
+    >
+      {loading ? (
+        <div style={{ textAlign: 'center', padding: 40 }}>
+          <Spin />
+        </div>
+      ) : !task ? (
+        <Empty description="任务不存在或加载失败" />
+      ) : (
+        <div>
+          <Descriptions column={2} bordered size="small">
+            <Descriptions.Item label="状态">
+              <TaskStatusTag status={task.status} />
+            </Descriptions.Item>
+            <Descriptions.Item label="优先级">
+              <PriorityTag priority={task.priority} />
+            </Descriptions.Item>
+            <Descriptions.Item label="任务类型">{task.task_type}</Descriptions.Item>
+            <Descriptions.Item label="需要审核">
+              {task.requires_review ? (
+                <Tag color="purple">是</Tag>
+              ) : (
+                <Tag>否</Tag>
+              )}
+            </Descriptions.Item>
+            {task.review_status && (
+              <Descriptions.Item label="审核状态">{task.review_status}</Descriptions.Item>
+            )}
+            {task.worker_id && (
+              <Descriptions.Item label="AI Worker">#{task.worker_id}</Descriptions.Item>
+            )}
+            {task.due_date && (
+              <Descriptions.Item label="截止时间">
+                {dayjs(task.due_date).format('YYYY-MM-DD HH:mm')}
+              </Descriptions.Item>
+            )}
+            {task.started_at && (
+              <Descriptions.Item label="开始时间">
+                {dayjs(task.started_at).format('YYYY-MM-DD HH:mm')}
+              </Descriptions.Item>
+            )}
+            {task.completed_at && (
+              <Descriptions.Item label="完成时间">
+                {dayjs(task.completed_at).format('YYYY-MM-DD HH:mm')}
+              </Descriptions.Item>
+            )}
+            <Descriptions.Item label="创建时间">
+              {dayjs(task.created_at).format('YYYY-MM-DD HH:mm')}
+            </Descriptions.Item>
+            {task.description && (
+              <Descriptions.Item label="描述" span={2}>
+                {task.description}
+              </Descriptions.Item>
+            )}
+          </Descriptions>
+
+          <div style={{ marginTop: 16 }}>
+            <Paragraph strong style={{ marginBottom: 8 }}>
+              输入（Prompt / 参数）
+            </Paragraph>
+            {renderJsonBlock(task.input_data)}
+          </div>
+
+          <div style={{ marginTop: 16 }}>
+            <Paragraph strong style={{ marginBottom: 8 }}>
+              输出结果
+            </Paragraph>
+            {renderJsonBlock(task.output_data)}
+          </div>
+        </div>
+      )}
+    </Modal>
+  );
+}