Cable connecting device

The utility model discloses a cable connecting device, which comprises a middle joint and two end joints which are in threaded connection, the middle joint and the end joints are respectively provided with a channel for a cable to pass through, two ends of the middle joint are respectively provided with an outer conical surface of which the outer diameter is gradually reduced, the end joints are provided with inner conical surfaces which are in contact with the outer conical surfaces, and the inner conical surfaces are provided with inner conical surfaces. An opening extending in the axial direction is formed in the side wall of the outer conical face. When the end joint is in threaded connection with the middle joint, the inner conical surface of the end joint extrudes the outer conical surface of the middle joint, so that the opening is closed to compress the cable. The cable connecting device solves the problem that existing cable connection consumes long time, and has the advantages of being high in conne