The invention relates to a pavement friction coefficient testing car, belonging to the field of road engineering construction. The pavement friction coefficient testing car comprises two testing wheels, a weight box and a traction connection yoke and is characterized in that the testing wheels are connected with each other by a shaft; a vertical beam is fixedly connected below the weight box and is connected with the shaft by a bearing; one end of the traction connection yoke is fixed on the vertical beam, and the other end thereof is connected with an external apparatus; a dynamometer is arranged between the traction connection yoke and the vertical beam; and the dynamometer is electrically connected with a data recorder. The pavement friction coefficient testing car can measure the friction coefficient of a pavement surface at the normal car running speed, overcomes the defect that the pavement friction coefficient is displayed differently in the former conditions of fixed point, lowspeed and high-speed wheel running, and simultaneously can measure the pavement friction coefficient in the condition of different tire grounding pressures.