Abstract: Based on micro control unit，a new type of sliding friction force measurement device is designed by using techniques of resistance strain sensor，ultrasonic velocity detecting，wireless transmission，LCD screen showing，DC acceleration and deceleration motor，etc. In comparison with the traditional experimental measurement of sliding friction force， the present device has the advantages of the convenient operation，high measuring accuracy， visual phenomenon，beautiful appearance，wide application prospect，etc. It can not only be used as teaching aid in the classroom demonstration，but also provide the references and thoughts of the smoothness determination of products， material friction coefficient measurement，etc. in the enterprise.

Key words: frictional force, micro control unit, measuring device, resistance strain sensor