The hot melt welding machine adopts the electric heating method, the movement is steady, the control is precise, the heat is transferred to the plastic parts through the hot melt head, and the hot-pressing deformation achieves the desired effect. The device adopts a plate-type structure and the electric heating method transfers the heat of the heating plate to the welding surfaces of the upper and lower plastic heating elements. The surface is melted, and then the heating plate is rapidly withdrawn, and the upper and lower heating pieces are heated and the melting surface is fused, solidified and integrated. The whole machine is in the form of a frame, which consists of three plates: the upper platen, the lower platen and the hot platen. It is equipped with a hot mold and a cold plastic mold. The action mode is pneumatic control. It is mainly applied to the welding of plastic parts such as household appliances, car lights, and automobile melters. According to the size of different plastic parts set heating power and mold size to achieve a variety of plastic workpiece welding, simple operation, easy to use. The heating plate consists of two blocks, heating it with a heating tube.