The invention provides a double-interface electric connector which comprises an insulation body, a first shielding casing wrapping the periphery of the insulation body and conductive terminals contained in the insulation body. A first butt-joint cavity and a first tongue plate portion positioned in the first butt-joint cavity are arranged in the insulation body, the upper side and the lower side of the first tongue plate portion are each provided with a plurality of conductive terminals, and a second butt-joint cavity, a second shielding casing clinging to the inner wall of the second butt-joint cavity and a second tongue plate portion positioned on the inner side of the second shielding casing are arranged in the first tongue plate portion. According to the double-interface electric connector, the first tongue plate portion and the second butt-joint cavity are arranged in the first tongue plate portion to form two butt-joint interfaces for being in butting joint with two electric connectors of different types simultaneously or independently, two functions are integrated into one electric connector, therefore, the double-interface electric connector can be used by a user more conveniently, and cost and space occupation can be reduced effectively.