政教处主任真像容嬷嬷
[zhèng jiào chŭ zhŭ rèn zhēn xiàng róng mā mā]
The user is comparing their school principal (head of the moral education office) to Empress Dowager Rong from the Chinese drama series 'Story of Yanxi Palace.' Empress Dowager Rong is portrayed as strict and stern, much like how a strict principal would be seen.