I want to quit my present job. What's with the social security transfer form?

Don't need any reason. The so-called transfer order may be the termination order. Specifically, you quit your current unit. The company wants to terminate your social security payment in the social security bureau. Let the company print a social security termination form for you and hide it yourself to prove that you have not paid social security in this company. When you go to another company to renew your insurance in the future, talk to the accountant there and give him the termination form, so that you can renew your insurance directly (it should be available online now)