The working principle of the oxygen removing machine is molecular separation closed-circuit circulation type, that is, the air in the air conditioning warehouse is pumped out through the pipeline, and the oxygen is separated through the separation tank of the equipment, and then the remaining air is sent back to the warehouse. The machine runs automatically through a circuit board in the microprocessor. Because the equipment adopts double-tank circulating work, it is characterized by fast oxygen reduction speed, low noise, maintenance free, less power consumption, its energy consumption is only 1/5 of the previous generation of hollow fiber membrane nitrogen machine, no air compressor, no need to replace the filter element, achieve no maintenance operation, high reliability, is the fifth generation of products in the air conditioning equipment.