Can employees pay more social security?

No, as employees of enterprises, the proportion of contributions borne by enterprises and individuals is fixed. Even if you pay more yourself, it is meaningless, and you can't pay more yourself. Unless you ask the enterprise to raise your payment index, for example, your previous payment index was based on 60% of the basic old-age insurance, then you can pay your own basic old-age insurance according to 80% or even 100% in the future, so that your payment ratio will be relatively increased and the payment amount will also be increased.