Shenzhen social security has not been paid for two years. Does it still work?

You can spend it. Even if you don't have the money to enter the medical insurance account, you can't enjoy medical insurance when you go to the hospital, but the money in your original account can still be used.

At present, the only part of social security that can be consumed is the balance in the medical insurance account. In addition to the part paid by yourself, some medical insurance paid by the company will also enter your account.

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