For automatic dry clutches, it is important to obtain the accurate friction torque to improve the control effect of the clutch. And the precision of the friction torque is largely dependent on the precision of the friction coefficient. So in order to analyze the relationship among friction coefficient, clamping force, rotate speed and surface temperature of dry clutch plates, a friction coefficient measurement bench is designed. The bench is made up of the mechanical system, the servo-motor control system and the data acquisition system. The mechanical system is composed of a base, a speed reducer, a spring and so on, it is mainly to achieve the manual pressure adjustment. The servo motor control system consists of a touch screen, a PLC controller, a servo motor drive and so on, it is mainly to achieve the control of the motor speed and direction. The data acquisition system consists of a single-chip, a computer and so on, it is to achieve the function of data acquisition and display. The experiments showed that the bench had the functions of controlling clamping force and rotate speed, and it could also collect signals of clamping force, rotate speed, friction torque, surface temperature and friction coefficient synchronously. The bench plays an important role in the friction coefficient research.