You can't pay double social security, and an ID card can only participate in one social security. Two social insurances in different provinces need to be calculated together.

Endowment insurance paid in different places in different periods can be transferred according to regulations, and the payment period and personal account are combined. However, repeated payment at the same time cannot be combined.

According to national laws and regulations, an employee (citizen) can only pay social insurance contributions once in the same social security co-ordination area (generally in prefecture-level cities). It doesn't matter if you pay two social insurances at the same time, you can choose to merge into one of them. In addition, after suspension or retirement, you can choose to keep a large amount of social security, and another social security can refund the amount paid by individuals.

Extended data

According to the relevant documents of Ministry of Human Resources and Social Security, if the insured person has a basic old-age insurance relationship or repeatedly pays the basic old-age insurance premium in two or more places at the same time, it shall be cleaned up according to the principle of "transfer first and then liquidation".

To put it simply, the social security paid by the two places in the same month cannot be merged. The individual part of a city is returned, and the part paid by the enterprise is returned to the local social security pooling fund to ensure the local pension payment.

References:

Database of laws and regulations-People's Republic of China (PRC) Social Insurance Law (revised version 20 18)