Abstract: In order to improve the wear resistance of 0Cr17Ni12Mo2 stainless steel, the cobalt-based coatings were prepared on the surface of 0Cr17Ni12Mo2 stainless steel with different roughness using laser melting technology. The macroscopic morphologies, microstructure, hardness and wear resistance of the coatings were investigated using optical microscopy, scanning electron microscopy, hardness tester and friction wear testing machine. The results show that a metallurgical bond is formed between the coating and the matrix, and the junction between the coating and the substrate has a wavy shape due to a combination of factors such as different heat transfer and cooling crystallization conditions in each region.With the sandblasting time increasing, the average hardness value of the coating first increases and then decreases; when the sandblasting time is 1 min, 2 min, 3 min, 4 min, the average friction coefficient of the coating is 0.387, 0.301, 0.423 and 0.383respectively, with the increase of the sandblasting time, the wear of the coating first decreases and then increases, and the wear resistance of the coating is enhanced.