The invention discloses a surface treatment method for weathering resistant steel. The method comprises the following steps that firstly, the weathering resistant steel is subjected to surface shot blasting treatment, and the surface roughness of the weathering resistant steel is between Ra 2.50 microns and Ra 3.50 microns; and secondly, the weathering resistant steel subjected to shot blasting treatment is subjected to high-temperature oxidation for 1 h-4 h at the temperature of between 250 DEG C and 350 DEG C, and then a dense rufous oxidation layer can be obtained. The appearance and color of the oxidation layer are similar to those of the weathering resistant steel used for a long time, and forming of a stable rust layer can be promoted. The method is simple in procedure, cost is low, environment friendliness is achieved, and it is avoided that a common surface stabilization coating applying method is utilized for rapidly stabilizing the weathering resistant steel, and consequently the environment is polluted.