Laser welding machine is a highly efficient and precise welding method using a high energy density laser beam as the heat source. Laser welding is one of the important applications of laser material processing technology. The welding process belongs to the heat conduction type, that is, the laser radiation heats the surface of the workpiece, the heat on the surface diffuses internally through the heat conduction, and the workpiece is melted by controlling the parameters such as the width, energy, peak power and repetition frequency of the laser pulse to form a specific molten pool. Because of its unique advantages, it has been successfully applied to the precision welding of micro and small parts.