The invention discloses a method for measuring pressure in a rotating state. The method comprises: installing a demarcating device on a test piece to form a pressure-tight demarcating chamber, feeding gas into the demarcating chamber, measuring voltage signal values of a sensor and gas pressure values of the corresponding chamber, fitting a curve to obtain a pressure calibration curve in a stationary state; feeding gases with different pressures in the demarcating chamber and rotating the test piece at different rotating speed, measuring the voltage signal values of the sensor corresponding the gas pressure in the present demarcating chamber under each rotating speed, fitting a curve to obtain a pressure calibration curve in the rotating state; obtaining an actual pressure value of the demarcating chamber through temperature of the demarcating chamber under each rotating speed, and modifying the pressure calibration curve in the rotating state; and combining the modified calibration curve and the signal values under each rotating speed measured by the pressure sensor in a test condition to obtain an actual pressure value of the pressure sensor. The method for measuring pressure in the rotating state makes test results capable of being reference, and ensures measuring precision of the test at the same time.