The air compressor of this product compresses the external air, and after the dew point is reduced to -20℃ through the polymer dehumidification tube, the high-temperature catalytic furnace performs high-temperature oxidation and decomposition of CO, hydrocarbons and ozone, and then adsorbs SO2, nitrogen oxides, etc. through the filter material, and finally outputs zero-level air with stable pressure through the pressure regulating valve.