Automobile fourth wheel positioning detector

The utility model provides an automobile four-wheeled position detection instrument, relating to a detection instrument. The utility model aims to solve the problems that the prior automobile four-wheeled detection and position are calibrated at a time by a factory when the detection instrument is mounted, the inclination angles are generated among four wheels in the using process and users can not calibrate the four wheels. In the utility model, each front wheel solid target (6) and each rear wheel solid target (7) are respectively fixed on a fixture (8); two camera mounts (1) are respectively arranged on front sides of two front wheel solid targets(6); each camera mount (1) is lengthways provided with two cameras (4);and the cameras (4) are connected with a computer (2) through a data wire. The detection instrument can directly observe patterns on the solid targets which are taken by the cameras through a display of the computer, and adjust positions of automobiles according to the positions of the targets in the pictures; and the computer calculates various inclination angles of corresponding wheels according to the special positions of the targets, so as to determine whether the adjustment is needed and how to perform the adjustment.