The utility model provides a large-size cable wire electric head fusing and twisting machine, comprising a left bearing seat, a right bearing seat, a left trapezium threaded shaft seat, a right trapezium threaded shaft seat, a left clamping device and a right clamping device arranged on two sides respectively, wherein an ultra-audio frequency heating device is arranged at the place where a cable wire is clamped between the two clamping devices; a reversing device is also arranged at that place so as to adapt to the twisting direction of the cable wire; the cable wire is heated to be at a required temperature; the transmission of a motor leads the cable wire to be twisted and withdraw by the gear transmission and the trapezium thread shaft seats; the shape of a cone is formed at the broken place of the cable wire; and the head of the wire is not loose. Therefore, the working efficiency is improved, the labor intensity is reduced, the head twisting speed is uniform and adjustable, and the operation is convenient.