The invention discloses a social security composite card, comprising a bank card integrated circuit chip, a social security card integrated circuit chip and an induction coil, and also comprising a switch, a switch control circuit, a man-machine operation module, a data processing module and a positioning module. The man-machine operation module and the data processing module are in connection; the data processing module and the switch control circuit are in connection; the operation module and the data processing module are both internally provided with an encryption module; the data processing module is also internally provided with an authentication module; a firewall module is arranged between the data processing module and the switch control circuit; a connection module for connecting two independent channels is arranged between the man-machine operation module and the data processing module. The social security composite card perfectly combines a social security card a bank card, can perform conversion according to needs, and is multifunctional; a lost social security composite card can not be used by the one who picks up the card, and can be located timely through a positioning device.