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The complex aerodynamic influence caused by the propeller slipstream can only be obtained in wind tunnel tests at present. In order to accurately measure the aerodynamic force and obtain the influence of the propeller slipstream, a rotating shaft balance is directly connected to the propeller and rotates synchronously at a high speed to conduct the wind tunnel. test. In-depth research on the experimental principles and data processing methods of the rotating shaft balance was carried out, and the wind tunnel rotating shaft balance signal processing system was designed and developed. Comprehensive consideration of signal attenuation, electromagnetic environment and other interference issues, the acquisition is triggered by the clock backplane to ensure the synchronization of signal acquisition, and the overall processing accuracy of the system and other indicators meet the technical requirements of the test. It also innovatively developed the continuous measurement technology of wind tunnel dynamic data, which greatly improved the test efficiency. After many wind tunnel tests, the functions of conditioning, collecting and processing the signals of the rotating shaft balance have been realized, providing technical support for high-efficiency, low-noise advanced propeller design and turboprop aerodynamic noise design.