在VSCode安装Markdown All in One或Markdown Preview Enhanced即可

插件Markdown All in One

GitHub：https://github.com/yzhang-gh/vscode-markdown
v3.6.2下载链接：https://marketplace.visualstudio.com/_apis/public/gallery/publishers/yzhang/vsextensions/markdown-all-in-one/3.6.2/vspackage

插件Markdown Preview Enhanced

GitHub：https://github.com/shd101wyy/markdown-preview-enhanced
安装教程：https://shd101wyy.github.io/markdown-preview-enhanced/#/zh-cn/vscode-installation

个人感觉Markdown Preview Enhanced比较好用：