The utility model relates to a car brake performance detecting system calibrating installation based on stereovision belongs to the car performance and detects way examination equipment. The device utilizes 2 camera collections to receive the facula image on the worn -out fur, adopts the computer image processing technique, carries out facula image processing and three -dimensional coordinate and rebuilds, obtains the facula and at the uniform velocity, spares with higher speed and the curvilinear motion orbit of uniformly retarded motion in -process, and the evaluation is based on the automobile brake performance detecting system's of stereovision precision. The device includes: 2 the guide rail of individual customization, 1 configuration receive the portable dolly of worn -out fur, 1 portable dolly that disposes red light source, 2 step motor, 4 take -up pulleys, 2 photoelectricity shaft encoder and an industrial control computer etc.. The utility model discloses can obtain the movement track by portable dolly simulation car brakeing process in real time. This design theory is novel unique, verifies that the precision is good, and simple structure, the installation operation of being convenient for. The achievement in research has fine application promotion prospect.