Can I use the Shanghai social security card without returning it?

Legal analysis: you can continue to use it that month. Under normal circumstances, if you participate in employee medical insurance, but later stop paying because of resignation and other reasons, then your medical insurance account will be sealed in the next month when you stop paying, and you can't enjoy medical insurance benefits.

Legal basis: People's Republic of China (PRC) Social Insurance Law.

Article 4 Employers and individuals who pay social insurance premiums according to law in People's Republic of China (PRC) have the right to inquire about payment records and personal rights and interests records, and ask social insurance agencies to provide social insurance consultation and other related services.

Individuals enjoy social insurance benefits according to law and have the right to supervise the payment of their own units.

Fifth people's governments at or above the county level shall incorporate social insurance into the national economic and social development plan.

The state raises social insurance funds through multiple channels. People's governments at or above the county level shall give necessary financial support to social insurance.

The state supports social insurance through preferential tax policies.