What if the quarrel between husband and wife is maliciously recorded by neighbors and posted online?

Report to the police station and collect evidence to sue each other.

Doing so is an infringement on the privacy of others, and if it has a great impact, it may be punished accordingly.

Look for property management first. If the circumstances are serious, you can call the police directly. If you are maliciously complained by your neighbors, it may infringe on your reputation and reduce your social evaluation. The civil subject enjoys the right of reputation. No organization or individual may infringe upon the reputation right of others by insulting or slandering. If a malicious complaint infringes on the right of reputation, it may request the infringer to bear corresponding civil liability.