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An automatic detection for crosswind based on wind-tunnel experiment is presented, and a digital crosswind sensor is developed. In order to analyse crosswind velocity on the impact of stream’s pressure difference and air density, a mathematical model is established. A formula is deduced to calculate crosswind’s velocity according to the theory of aerodynamics, which is validated by wind-tunnel experiment after the design parameters is given. It describes the sensor’s hardware circuit and principle, as well as the subordinate computer’s programs; The pressure difference sensor acquisitions the free stream’s pressure difference signals by virtue of the probe. The temperature sensor monitors environment temperature to translate the air density by the aid of ROMs.MCU MSP430 exports crosswind’s velocity, combining with pressure difference and air density. IIR digital filter algorithm is adopted to suppress high frequency noise of pressure difference effectively. 