The fiber laser welding machine has the characteristics of large welding depth ratio, small specific energy, small heat-affected zone, small deformation of welded parts, and smooth and beautiful welded workpieces. Especially suitable for welding precision parts and heat sensitive parts. The laser beam of the metal laser welding machine can quickly melt different types of metal materials, even metal materials that are difficult to weld with traditional welding machines, such as carbon steel, stainless steel, aluminum structural steel, copper and other metals.