Apple watch播放音乐不自动播下一首

Did you make sure, that your Music Controls are set to Autoplay?

Have a look at the related article:

Play music on Apple Watch - Apple Support

在 Apple Watch 上播放音乐 - 官方 Apple 支持 (中国)

You will have a better chance of getting the help you need if you post your question to the community forum linked below:

如果您在以下链接的社区论坛上发布您的问题，您将有更好的机会获得所需的帮助：

官方 Apple 支持社区