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Plastic laser welding is to assemble two plastic parts to be welded together with external pressure, and then a short-wave infrared laser beam is directed to the welding area to realize plastic laser welding. The laser beam passes through the upper transparent material, and then the lower material absorbs the short-band infrared laser, and then the laser is absorbed to realize the conversion of light energy into heat energy. Because the upper and lower layers of materials are bonded together by external pressure, the two layers of materials are melted and combined together. At the same time, due to the thermal expansion of the material itself, internal stress and external pressure work together to ensure that the bonding surface of the two materials is fully attached, melted and solidified so as to realize the plastic laser welding process. For the product material itself on the short wavelength infrared does not absorb, our company provides a long band 2 micron plastic laser welding or on the absorption layer coated with laser additives, so as to achieve plastic laser welding process.