The surface of AerMet100 steel is treated by semiconductor laser melting, and the influences of laser melting on microstructure, corrosion resistance and wear resistance of materials are investigated. The results indicate that the melting layer with a good metallurgical quality and without cracks can be obtained by laser melting. In the power range of 750-1650 W, the thickness, hardness, corrosion resistance and wear resistance of the melting layer increase with the increase of laser power. When the laser power is 1650 W, the hardness, corrosion resistance and wear resistance of the melting layer are optimal. The phase of AerMet100 steel does not change significantly after laser melting, but the austenite content decreases and the martensite content increases.