In oroler to solve the problem of measuring pitch angle of model in wind tunnel test, a design scheme of micro angle of attack sensor is proposed. The integrated circuit design is used to integrate the attitude angle sensing component, acquisition and processing unit and other components into the sensor to improve the anti-interference ability of the signal. Temperature compensation and multi-level error correction methods are used to correct the data, and Kalman filtering method is used to fuse the vibration sensor data on the basis of the angle measured by the acceleration sensor, so as to increase the anti-vibration ability of the equipment and improve the accuracy of the sensor data. In the wind tunnel test, the measured value of the angle of attack sensor and the signal of the balance are corrected synchronously through the relationship between the measured value of the balance X element and the pitch angle. The results show that the pitch angle data is accurate and reliable, and the synchronization effect meets the test requirements.