The invention relates to a surface treatment process and in particular to a treatment process for a rotor surface. The treatment process for the rotor surface can form continuous and complete Lanhua membrane with the uniform color and no rusty spots and can meet the requirement for the product quality. The treatment process comprises the steps that firstly, oil removal treatment is performed on a rotor, wherein the temperature of the oil removal process is 50-410 DEG C, and the oil removal time is 40-60 min; secondly, heat preservation treatment is performed on an area A and an area B of the rotor obtained after oil removal treatment is performed, wherein the heat preservation temperature of the area A is 405-410 DEG C, the heat preservation time is 40-60 min, the heat preservation temperature of the area B is 425-435 DEG C, and the heat preservation time is 40-60 min. According to the designed treatment process for the rotor surface, the rotor surface is treated, and then the rotor Lanhua membrane is continuous, complete, uniform in color and free of rusty spots and achieves the treatment effect, so that the requirement for the product quality is met.