Laser welding is the use of laser energy, a number of different materials, different thickness and different coating steel and stainless steel were automatic registration and welded together and form a whole sheet, profiles, sandwich board, etc., to meet the different requirements on the material properties of the parts, the lightweight design of equipment with the lightest weight, optimal structure and optimal performance. The device has a large pressure force, high welding precision, and can prevent the deformation of the welded steel plate, and the welding speed is fast, the efficiency is high, and the welding speed is finished.