The invention provides an oxygen generation control system of a PSA oxygen generator. The PSA oxygen generator comprises an air compressor, a freezing dryer and an oxygen generator; an oxygen generation control system of the PSA oxygen generator at least comprises an air tank drainage system, an oxygen concentration adjusting control and alarm system, a freezing dryer control system, a PLC controlprogram and a network control system; the air tank drainage system at least comprises a pressure sensor mounted at the bottom of an air storage tank, a drainage air control valve mounted at the bottom of the air storage tank and a dew point monitoring device mounted at an exit of the air storage tank. In the drainage system of the control system, a pressure sensor and a drainage air control valveare mounted at the bottom of the air storage tank, and a dew point monitoring device is mounted at the exit of the air storage tank; the drainage time and drainage interval of the air tank can be accurately controlled according to the pressure and dew point of the air tank; therefore, the oxygen generation control system of the PSA oxygen generator has the advantages of more accurate control, more stable performance and high safety.