By using Nd∶YAG solid-state lasers, the scanning test of 50CrNiMoVA spring steels is performed, and the butt welding with W2Mo9Cr4VCo8 high-speed steels is also done. The influences of laser process parameters on weld formation are analyzed, the microstructures of welding joints are observed, the welding joint performance tests are carried out, and the effect of heat treatment on the microstructures and properties of welding joints are discussed. The test results show that, when the laser power is 1000-1100 W, the welding speed is 3 m·min-1, and the flow rate of protecting gas Ar is 15 L·min-1, the smooth welding seams without obvious defects and also with a high aspect ratio, a good surface forming, a high strength, and a firm joining between tooth and back materials can be obtained. After welding, the heat treatment makes the bending and tensile properties of joints improve obviously, and the bending angle is larger than 90°. The welding seam does not crack along the longitudinal and transverse directions. The sawing life test result shows that the joints can meet the requirements of saw belt production.