Cantilever fiber mold laser welding machine is a new type of welding processing, mainly for thin-walled material precision parts welding, can realize butt welding, sealing welding, spot welding, stack welding, etc., small welding seam width, high depth to width ratio, small heat affected zone, small deformation, fast welding speed, smooth and beautiful welding seam, no treatment or only simple treatment after welding, high quality welding seam, no porosity, precise control of positioning accuracy, small focusing spot, easy to realize welding automation.