In view of the strict performance requirements of screw air compressor oil in oxidation resistance,friction and wear resistance and oil-water separation,the base oil composed of mineral oil and synthetic oil was adopted,and appropriate phenolic antioxidant,amine antioxidant,metal corrosion inhibitor,extreme pressure anti-wear agent and other functional additives were added,and a screw air compressor oil with stable antioxidant and excellent extreme pressure and anti-wear was developed.The extreme pressure performance and friction and wear properties of the developed oil were evaluated on the four ball friction and wear test machine,and simulated oxidation evaluation test was carried out.The results show that the developed oil has excellent oxidation resistance,can meet the long oil change cycle of 5 000 h,and its performance is equivalent to that of imported special oil.