Objective To efficiently solve the problem that the coating surface prepared by DC jet-electrodeposition is quite rough, and the surface deterioration degree is particularly serious when the hard particle size reaches micron grade. Methods Reverse pulse current was applied in jet-electrodeposition instead of DC to prepare the Co-Cr3C2 composite coatings which the size of Cr3C2 reaching micron grade. Through analyzing the composite tissue morphology and testing hardness, wear resistance and other performance parameters, the effect of commutation pulse electrical parameters on the composite coating particle composite coating, the roughness of the coating and the coating performance were discussed, and the influencing mechanism was analyzed. Results Using pulse current to prepare Co-Cr3C2composite coating could improve the surface roughness while maintaining higher concentration of the particles. By controlling the pulse electric parameters, micron grade Co-Cr3C2 composite coating with particle content of up to 11% was prepared. Conclusion The higher the Cr3C2 particle content in the composite coating, the better the coating performance, but the more rough the coating surface. The reversing of the reverse pulse current could lead to the inverse process of co-deposition. The usage of RPC could not only make the composite coating flat, but also improve the uniformity of particles dispersed in the composite coating, improving both the surface morphology and properties of the composite coating.