A socket connector comprises a circuit board with a socket part mounted on the outside thereof; a socket shield part; a metal shield plate with a through-slot, on the outside of which the socket shield part is mounted; a shield shell with openings on the wall thereof, forming into a shield chamber for fitting a plug and arranged on the socket shield part; and elastic shielding sheets, snapped into the openings and protruding outwards from the openings, wherein the socket part is inserted into the shield chamber formed by the shield shell through the through-slot of the metal shield plate. The elastic shielding sheets can be easily mounted since they are snapped into the shield shell; due to protruding outwards, the elastic shielding sheets come into contact with the inner surface of the shell of the plug to enable shield when the plug is inserted, so that the surface of the shell of the plug will not be scratched; due to the providing of the metal shield plate, the partial shield around the socket part can achieved, resulting in that the stability of the transmission of the ultrasonic signal is secured.