Abstract: For the problem that traditional air speed sensor always cannot properly reflect value of ambient air speed because underground environment often causes performance degradation of ultrasonic probe, the paper proposed a design scheme of mine-used air speed sensor based on Pitot tube, and introduced principle and designs of hardware and software of the sensor in details. The sensor uses S-type Pitot tube to measure air pressure, uses differential pressure chip to calculate value of differential pressure signal, and calculates air speed according to corresponding relationship among electrical signal, differential pressure signal and air speed. The experimental results show that measurement error of the sensor is less than ±0.2 m/s in air speed range of 0.4～15 m/s, and the sensor has good characteristics of temperature stability, storage, moisture proof and dustproof.