Abstract: To improve the overall performance of the sprocket from multiple aspects and enable it to better adapt to complex working conditions in coal mine scraper conveyors, the welding repair process of the sprocket in coal mine scraper conveyors is studied and its wear resistance is analyzed. Using 40CrNiMoA steel as the base metal material, ER69-1, YD212, and ENiCrFe-3 as transition layer welding wires, multi-layer and multi pass welding is used to repair the chain wheel of the coal mine scraper conveyor; Analyze the wear resistance of repaired sprockets using an abrasive wear testing machine. The results showed that with the increase of abrasive quartz sand particle size, the wear of chain wheels repaired with different base metal materials showed a trend of first decreasing and then increasing; There is a negative correlation between the hardness of metal materials and the wear of repaired sprockets. 44 is the optimal material hardness, which can improve the wear resistance of repaired sprockets; Under different sliding strokes, YD212 welding wire has the smallest friction coefficient and fluctuation amplitude, making it the optimal transition layer welding wire; The welding current is positively correlated with the friction coefficient of the repaired sprocket. When the welding current is 280A, the wear resistance of the repaired sprocket is optimal; When the ratio of welding to welding current is 16, the friction coefficient is minimized, therefore 16 is the optimal ratio.