Laser welding is the use of high-energy laser pulses to heat the material locally in a small area, and the energy of the laser radiation is diffused to the inside of the material through heat conduction, and the material is melted to form a specific molten pool. It is a new type of welding method, which is mainly aimed at the welding of thin-walled materials and precision parts. It can realize spot welding, butt welding, overlap welding, seal welding, etc., with high depth-to-width ratio, small weld width, small heat-affected zone, small deformation, fast welding speed, smooth and beautiful weld seam, no treatment or simple treatment after welding, high weld quality, no pores, and accurate control, the focus spot is small, the positioning accuracy is high, and it is easy to realize automation. It can be said that the emergence of laser welding technology has given a qualitative leap in welding technology, so that metal and non-metallic materials of different materials can be easily connected. In the future, the application of laser welding technology will not only be the current electronics, automobiles, instruments and other fields, but also will be more extensive in the military and medical fields, especially in the medical field, with the help of laser’s high energy, high fusion, no pollution and other characteristics in the future of neuromedicine, biological reproduction and other fields have broad prospects. At the same time, with the continuous upgrading of the laser welding machine, the precision of the laser welding machine is continuously improved, and the fine processing method will make the laser welding technology play an increasingly important role in the future micro processing field. Although the price of the laser welding machine, the price of the laser marking machine and the price of the laser cutting machine are more expensive than the traditional equipment, the laser equipment has incomparable advantages in efficiency and technology. I believe that in the future, laser welding technology will inject new impetus into our current processing together with other laser application technologies.