The pay-off mechanism of the traditional steel wire plier overcomes the spring tension between the positioning pin installed on the swing rod and the positioning pin installed on the fixed plate of the frame by pulling the pay-off steel wire mechanism through the winding steel wire mechanism, so that the swing rod rotates upward around the rotating shaft at its end, and after reaching the predetermined tension of the pay-off steel wire at a predetermined angle, the received signal is transmitted to the PRC through the position sensor installed at the rear end of the swing rod, and after the signal processing, the PRC releases the brake of the electromagnetic drive, and the wire wheel pays off. Because the tension generated by the spring is realized by its own elastic deformation. With the increase of stretching length, the pulling force will also increase, and the pulling force is not constant. The speed of the steel wire changes during the pay-off, and the position of the pay-off point of the swing rod is also unstable during this process, and the spring will repeatedly stretch and retract. In this process, the tension of the paying-off steel wire will change with the change of the spring length, and the accumulated fatigue stress of the spring will also cause it to be pulled off after a long-term operation. When multiple steel wires are combined, the length of each steel wire wound on the reel is inconsistent due to the unequal tension of each steel wire, and the hanging difference is large, which affects the quality of steel wire combination.