The invention relates to a short-circuit electric connector which is an electric connector which carries out short-circuit or open-circuit switching among contact components and is provided with a preservation mechanism and a short-circuit module. The short-circuit electric connector comprises a plug, a switchover base combination component, a maintenance mechanism, a short-circuit module and a socket, wherein the plug comprises a guide pin, a casing, an insulation base, a jack contact component, an installation plate, a sealing ring and a locking screw. The switchover base combination component comprises a leading wire, a needle base, an insertion needle contact component and a screw sleeve, and the maintenance mechanism comprises a supporting spring and a cover casing. The short-circuitmodule comprises a hole upper base, a short-circuit jack contact component, a hole lower base, a retainer ring, a riveting pipe, a spring washer, a pull rod, a screw cap and a short-circuit wire. Thesocket comprises a casing, an insertion needle, a separation spring, a baffle plate, an upper insulation base, a push rod, a supporting spring of the push rod, a lower insulation base, a floating riveting pipe, and an installation screw. By the insertion and combination of the plug and the socket and the insertion and pull of the short-circuit module, a short-circuit and open-circuit switching function between lines is realized.