Nitrogen generator is a nitrogen generating equipment designed and manufactured according to pressure change adsorption technology. The nitrogen generator uses high quality imported carbon molecular sieve (CMS) as adsorbent, and adopts the principle of Pressure Swing Adsorption (PSA) to separate the air at room temperature to produce high purity nitrogen. Usually two adsorption towers are connected in parallel, and the imported PLC controls the imported pneumatic valves to run automatically, alternately carrying out pressurized adsorption and decompression regeneration, completing the separation of nitrogen and oxygen, and obtaining the required nitrogen gas with high purity.