PSA nitrogen generator is mainly composed of two adsorption towers equipped with carbon molecular sieve,after the clean and dry compressed air enters the adsorption tower, the molecular sieve adsorbs the nitrogen and oxygen components differently, and adsorbs a large amount of oxygen, water, carbon dioxide and other components in the air, while the unadsorbed nitrogen is at the outlet of the adsorption tower After being enriched into product gas, the carbon molecular sieve adsorbs a certain amount of gas, decompresses and analyzes the adsorbed oxygen, water, carbon dioxide, etc. to achieve regeneration. The two towers alternately adsorb and regenerate and continuously produce product nitrogen.