Dowin fiber laser welding machine is a kind of laser welding equipment that couples a high-energy laser beam into an optical fiber, and after long-distance transmission, is collimated into parallel light by a collimating mirror, and then focused on the workpiece for welding. For the parts that are difficult to access to welding, flexible transmission non-contact welding is implemented, which has greater flexibility. The laser beam of the optical fiber transmission laser welding machine can realize the splitting of time and energy, and can process multiple beams at the same time, which provides conditions for more precise welding.