The invention provides a calibration method and system for a wind pressure sensor. The measured value of the tested wind pressure sensor is converted into a comparable wind speed value through a conversion formula, deviation calculation is carried out on the measured wind speed value of a calibrated anemoscope, the reliability of the tested wind pressure sensor is verified, the factors such as theair density, the atmospheric temperature and the humidity are combined during the calibration, and the accuracy of the experiment is further improved. The method comprises the steps of erecting the anemoscope and the tested wind pressure sensor, measuring the air density in the wind tunnel, and converting the wind pressure data into wind speed data, calculating the average wind speed value and the fluctuating wind speed value of the wind speed sequence obtained through the measurement of the anemoscope and the tested device, performing the deviation calculation on the result to determine theaccuracy of the tested sensor.