Abstract: FeCrBSiNi coating was prepared on surface of Q235 steel used for industrial boiler by own patented supersonic arc spray gun and spraying device using FeCrBSiNi wire as raw material. The porosity, microstructure, micro-hardness, wear resistance and bonding strength of the coating were studied. The results show that the porosity of FeCrBSiNi coating prepared by supersonic arc spraying was 0.71%. The interface between the coating and substrate was relatively flat. The coating had no obvious delamination phenomenon. The structure of the coating was compact with few holes. The average micro-hardness of FeCrBSiNi coating was 720 HV0.3, much higher than that of substrate Q235 steel. The coating and the substrate was combined mechanically and the bonding strength reached 60 MPa. After the friction and wear test, the mass loss of the substrate was 28 times that of the coating, and the wear resistance of the coating was much better than that of the substrate.