Abstract: In order to study the applicable thickness of the anodic oxide layer of the pressure cylinder for high-voltage switchgear, and establish a rapid evaluation method for the factory test, the effects of different oxide layer thickness of pressure cylinder for high-voltage switchgear on the hardness, wear resistance and corrosion resistance of the oxide layer, and the effect of sealing on the oxide layer were studied. The thickness and hardness of the oxide layer obtained by different test methods were compared and analyzed. The results show that there was a positive correlation between the thickness of the anodic oxidation layer and the hardness, wear resistance and corrosion resistance of the oxide layer. With the increase of the thickness of the anodic oxidation layer, the surface hardness, wear resistance and corrosion resistance of the oxide layer increased significantly. When the thickness of the anodic oxide layer inside the cylinder was 15-20 μm and the hardness was 346-359 HV, the thickness of the anodic oxide layer inside the cylinder had no effect on the product assembly, the anodic oxide layer had no obvious wear characteristics, and the wear resistance and corrosion resistance were excellent.