After passing through an air filter to remove dust and mechanical impurities, the air enters the air compressor and is compressed to the required pressure. After strict oil, water, and dust removal purification treatment, clean compressed air is output to ensure the service life of the molecular sieve in the adsorption tower. There are two adsorption towers equipped with carbon molecular sieves. When one tower is working, the other tower is depressurized for desorption. Clean air enters the working adsorption tower, and oxygen, carbon dioxide, and water are adsorbed by molecular sieves. The gas flowing to the outlet end is nitrogen and trace amounts of argon and oxygen. The other tower (desorption tower) separates the adsorbed oxygen, carbon dioxide, and water from the micropores of the molecular sieve and releases them into the atmosphere. In this way, the two towers take turns to complete nitrogen oxygen separation and continuously output nitrogen gas