diff --git a/cwd-api/src/api/admin/updateComment.ts b/cwd-api/src/api/admin/updateComment.ts
index 6ba43053..e4b43a8c 100644
--- a/cwd-api/src/api/admin/updateComment.ts
+++ b/cwd-api/src/api/admin/updateComment.ts
@@ -1,8 +1,8 @@
 import { Context } from 'hono';
 import { Bindings } from '../../bindings';
 import { checkContent } from '../public/postComment';
-import { marked } from 'marked';
 import xss from 'xss';
+import { parseMarkdown } from '../../utils/markdown';
 
 export const updateComment = async (c: Context<{ Bindings: Bindings }>) => {
   let body: any;
@@ -112,7 +112,7 @@ export const updateComment = async (c: Context<{ Bindings: Bindings }>) => {
     return c.json({ message: '评论内容不能为空' }, 400);
   }
 
-  const html = await marked.parse(cleanedContent, { async: true });
+  const html = await parseMarkdown(cleanedContent);
   const contentHtml = xss(html, {
     whiteList: {
       ...xss.whiteList,
@@ -138,4 +138,3 @@ export const updateComment = async (c: Context<{ Bindings: Bindings }>) => {
     message: `Comment updated, id: ${id}.`
   });
 };
-
diff --git a/cwd-api/src/api/public/postComment.ts b/cwd-api/src/api/public/postComment.ts
index 30dc980b..610a6811 100644
--- a/cwd-api/src/api/public/postComment.ts
+++ b/cwd-api/src/api/public/postComment.ts
@@ -1,8 +1,8 @@
 import { Context } from 'hono';
 import { UAParser } from 'ua-parser-js';
-import { marked } from 'marked';
 import xss from 'xss';
 import { Bindings } from '../../bindings';
+import { parseMarkdown } from '../../utils/markdown';
 import {
   sendCommentNotification,
   sendCommentReplyNotification,
@@ -134,7 +134,7 @@ export const postComment = async (c: Context<{ Bindings: Bindings }>) => {
   const name = checkContent(rawName);
 
   // Markdown 渲染与 XSS 过滤
-  const html = await marked.parse(cleanedContent, { async: true });
+  const html = await parseMarkdown(cleanedContent);
   const contentHtml = xss(html, {
     whiteList: {
       ...xss.whiteList,
diff --git a/cwd-api/src/utils/markdown.spec.ts b/cwd-api/src/utils/markdown.spec.ts
new file mode 100644
index 00000000..0c39ba44
--- /dev/null
+++ b/cwd-api/src/utils/markdown.spec.ts
@@ -0,0 +1,8 @@
+import { describe, expect, it } from 'vitest';
+import { parseMarkdown } from './markdown';
+
+describe('parseMarkdown', () => {
+	it('renders a single newline as a line break', async () => {
+		await expect(parseMarkdown('first line\nsecond line')).resolves.toBe('<p>first line<br>second line</p>\n');
+	});
+});
diff --git a/cwd-api/src/utils/markdown.ts b/cwd-api/src/utils/markdown.ts
new file mode 100644
index 00000000..7b4de451
--- /dev/null
+++ b/cwd-api/src/utils/markdown.ts
@@ -0,0 +1,11 @@
+import { marked } from 'marked';
+
+/**
+ * Parse comment Markdown with the same line-break behavior as the widget preview.
+ */
+export const parseMarkdown = async (content: string): Promise<string> =>
+	marked.parse(content, {
+		async: true,
+		gfm: true,
+		breaks: true,
+	});