Is social security compulsory in Shanghai?

Social security for employees is mandatory by the state, and all units and individuals must participate. In this regard, "Labor Law" Article 72 "Social insurance funds shall determine the source of funds according to the types of insurance, and gradually implement social pooling. Employers and workers must participate in social insurance and pay social insurance premiums according to law.

Further reading: How to buy insurance, which is good, and teach you how to avoid these "pits" of insurance.