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phones have become the mainstream, and the original method of using stainless steel as the main frame has gradually been replaced by CNC machining of the entire aluminum plate. The main frame of this aluminum processing reflects the advantages of non deformability, light weight, and anodizing. However, due to the difficulty in CNC machining of the middle plate, laser welding of the outer frame and middle plate solves the problem of CNC machining inability. R&D fiber optic transmission energy feedback laser welding machine has excellent welding performance, high energy, and more stable processing performance for aluminum.