Oxygen detection host testing system and method

The method comprises the following steps: calibrating an oxygen sensor after an oxygen detection host is electrified and stabilized, recording an oxygen concentration value detected by the oxygen sensor by a computer after calibration as an oxygen concentration theoretical value, closing a pressure container and an air outlet valve, opening an air inlet valve, pumping air into the pressure container, and starting the oxygen detection host; when the pressure in the pressure container reaches two barometric pressures, closing the air inlet valve, recording oxygen concentration values measured by the oxygen sensor under the two barometric pressures by the computer after the numerical value is stable, taking the oxygen concentration values as oxygen concentration actual values, and calculating a basic error; repeating the operation to respectively enable the pressure in the pressure vessel to reach 3-7 barometric pressures, closing the air inlet valve, and recording oxygen concentration values measured by the oxy