Hot plate welding machine mainly through the heating control the hot plate temperature(heating with electric heating and infrared heating), to realize the welding plasticity of workpiece, between the two plastic workpiece it is hot plate, when the workpiece is close to or conrtact heating plate, plastic began to melt, when reaching a certain degree of melting, the workpiece separately, the heating plate moving, then two pieces of workpiece weld together and workpieces cooling, curing finished the whole welding process.