Is it illegal for the unit to collect employees' Tik Tok accounts?

Illegal. Tik Tok account is registered with your mobile phone number and has passed the real-name authentication. It belongs to your personal property. The company uses this account to publish videos. If there is no special agreement, it cannot be compulsory. If necessary, it belongs to the personal virtual property borrowed by the company. No unit or individual is allowed to collect personal information without authorization, which is illegal. If the circumstances are serious, it can be sentenced.