The invention discloses a method for automatically declaring social security, wherein the method includes steps of pushing and importing staff declaration date of every customer to a declaration system at a fixed time; handling the declaration one by one according to the priority level until the staff of one customer, wherein the declaration system applies a Ukey integrator to switch the Ukey corresponding to the customer; the declaration system automatically turns on the website of the Social Security Bureau, and inputs the pre-configured password of the customer to log in; the declaration system automatically completes the declaration operation of the social security through the automatic sheet filling and the button click operation of the webpage; the declaration system acquires a prompt box popped out from the website of the social security, and acquires a successful mark or a failure remark. The invention further discloses a system for automatically declaring social security, comprising an automatic data pushing module, a center control server, a message server, multiple declaration executing machines, a Ukey switcher and a Ukey integrator. The automatic social security declaration can be effectively realized.