The invention discloses a connector and a core wire locking device. The easy loosening problem of a connector and wire cores after the stamping of large current lines can be solved. The main points ofthe technical scheme are that the device includes a connecting cylinder and a lock cylinder arranged in the connecting cylinder; a rotary extrusion mechanism is arranged between the connecting cylinder and the lock cylinder; a wire accommodating chamber is formed by the lock cylinder and the connecting cylinder; the wire accommodating chamber includes a chamber opening and a cavity; the rotary extrusion mechanism drives the lock cylinder to move to the chamber opening so as to realize the allocation of core wires in the cavity and clamps the core wires on the edge of the chamber opening; andthe core wires can be firmly extruded on the connector by means of rotary extrusion.