At present, ultra-thin mobile phones have become the mainstream, and the original method of using stainless steel as the main frame has gradually been replaced by CNC machining of aluminum whole plates. This main frame processed from aluminum reflects the advantages of being not easy to deform, light in weight, and easy to anodize. However, due to the difficulty of CNC machining on the middle plate, laser welding is used to weld the outer frame and middle plate, solving the problem that CNC cannot be processed. The fiber optic transmission energy feedback laser welding machine developed by Tongfa has excellent welding performance for aluminum materials, high energy, and more stable processing performance in high-power welding of aluminum materials.