Are there any subjects studying ancient etiquette and ancient musical instruments in the university?

There is no such major, but some students majoring in history and music will come into contact with it, and some students majoring in history may come into contact with it in the system of past dynasties and music history. Music majors include national musical instruments, some of which belong to ancient musical instruments.

If you really want to learn, let's see if there is a corresponding student club in your university. As far as I know, Peking University, Shandong University and Zhejiang University all have societies with corresponding contents.