Abstract: CoFeCrMnNi high entropy alloy coating was prepared on E32 steel substrate by plasma cladding technology.The microstructure, phase composition, microhardness and corrosion resistance of the coating were analyzed by SEM, EDS and XRD, and the composition of passive film of the coating was analyzed by XPS. The results show that the coating of CoCrFeMnNi high entropy alloy prepared by plasma cladding technology is metallurgically bonded with the substrate, and there are no defects such as cracks and pores. The coating has a simple FCC structure and presents a typical dendritic structure. In 3.5% NaCl solution, the self-corrosion potential of the coating is-0.19 V, the self-corrosion current density is2.43 ×10^-7A/cm², and the corrosion rate is 2.82 ×10^-3mm/a. Due to the dense passivation film formed by Ni, Cr and Co elements in the coating, the corrosion resistance of the coating is far superior to that of the substrate.