Aiming at the problem of low accuracy of the data obtained by rotary balance due to the large fluctuation of the velocity pressure in the actual wind tunnel test, a real-time velocity pressure measurement system of rotary balance based on NI cDAQ is designed. The principle and method of the multi-point static pressure drop method for measuring the velocity pressure are described, and the hardware composition and software design of the measuring system are introduced. The system is applied to the rotary balance test in the Φ5 m vertical wind tunnel. The results show that the system is stable and reliable, and can effectively overcome the problem of large fluctuation of velocity pressure, improve the accuracy of test data, and provide a strong guarantee for wind tunnel test.