In order to measure and analyze the unsteady loads on the rotor blade surface, a complete technical scheme of wind tunnel test is proposed. A multi-channel rotary data acquisition device is developed based on the design scheme of embedded sensors, and the synchronous sampling method of external clock and external trigger is used to realize the function of repeated sampling at equal angle intervals during the movement of the rotor, thus solving the synchronization problem between the azimuth angle of the rotor and the sample data. The wind tunnel test results verify the feasibility of the test technology.