PSA oxygen generator is a kind of oxygen generator developed according to PSA principle. High quality zeolite was used as adsorbent to separate oxygen from air directly at room temperature. After purification and drying, oxygen and nitrogen can be separated by PSA. Due to the selective adsorption characteristics of molecular sieves, nitrogen is adsorbed in molecular sieves, and oxygen is enriched in the gas phase of oxygen storage and exported as products. The system is equipped with two adsorption towers, one for oxygen production and the other for desorption. The cycle is alternate and oxygen is produced continuously.