The product flow rate is 1-500 Nm³/h. Pressure swing adsorption (PSA) oxygen generator taks sodium molecular sieve as adsorbent, utilizes the selective adsorption characteristics of molecular sieve, adopts the cycle period of air compressor pressure adsorption and atmospheric desorption to make compressed air alternately enter the adsorption tower to realize air separation, thus continuously producing high-purity oxygen products. PSA process is a simple oxygen generation method, the raw material is air and power consumption is only the power consumed by air compressor. It has the advantages of low operating cost and high efficiency.