The handheld laser welding machine uses a handheld welding gun instead of the previous fixed optical path. Handheld welding is flexible and convenient, and the welding distance is unconstrained. It overcomes the limitations of the worktable space and can emit light continuously or pulsed. It is widely used for welding thin metal plates within 3MM. Solving the trouble of traditional arc welding technology for thin plate welding, result in large melting, easy changeability, and subsequent processing. Laser welding has a small melting zone, minor deformation, better depth-to-width ratio, and strengthen welding. It is a flexible new welding process for long distance welding. It can realize spot welding, butt welding, lap welding, sealing welding, seam welding, etc.