Today, I received a salary card from Shanghai Social Security to 600 yuan. What happened?

The money sent to the salary card is generally after tax.

According to the current tax regulations, the salary of 4500 yuan after tax should be 4536.08 yuan before tax; After-tax salary of 1 1000 yuan should be 12 18 1.25 yuan before tax.

Specifically, you'd better communicate with your financial personnel and ask for a salary slip.

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