Under the conditions of the laser power is 70 W, the powder spreading thickness is 0.03 mm, and the laser scanning speed is 400 mm/s, the stainless steel specimens were formed. The effects of different heat treatment temperatures on tensile properties, hardness, and wear resistance of specimens were studied. The experimental results show that with the increase of heat treatment temperature, the residual metal powder in the specimen further melts and fills the holes, cracks, and other forming defects, which makes the internal microstructure of stainless steel uniform refinement and improves the tensile properties of the specimen. With the increase of temperature, the content of high hardness alloy also has a certain improvement, so that both the hardness of stainless steel specimens and the wear resistance are improved.