It is difficult to weld dissimilar metal materials of medical devices: differences in melting point, expansion coefficient, thermal conductivity and specific heat capacity of dissimilar metal materials, as well as differences between materials and tissues. The products are small in fine size and require high precision, requiring high magnification assisted by vision. Laser processing has many advantages, such as high precision, flexible processing, energy conservation, environmental protection, safety and cleaning, excellent surface quality, less or no post-treatment, etc., so it can become an ideal solution for medical device processing. Laser welding is mainly used to weld stainless steel, aluminum alloy and other metal products, which are also the most commonly used materials for medical devices; Due to the uniqueness of use, the production and manufacturing of medical devices require more precision. Laser welding technology is undoubtedly the best choice, which can effectively break through the limitations of traditional welding technology.