The invention provides full-automatic optical precision measurement equipment which comprises a rack, a light guide plate, a lifting mechanism, a follow-up mechanism, a positioning mechanism, an LED lamp, a mounting plate, a guide rail and a camera, the inner wall of the rack is rotationally connected with conveying rollers through bearings, the outer sides of the two conveying rollers are in transmission connection with a conveying belt, the conveying belt is made of a transparent material, and a first motor is fixed to one side of the rack. In the conveying process of the workpiece, the cameras can follow the workpiece to collect images in a follow-up mode, the working efficiency and the measuring precision are improved, when the two cameras alternately measure the workpiece, the heights and the positions are kept consistent all the time, the measuring precision is further improved, the heights of the cameras can be adjusted, and therefore, the device can be suitable for measurement of workpieces with different heights, and in the process of measuring the workpieces, the conveying belt cannot be suddenly stopped or started, so that the stability of placing the workpieces is improved, and the phenomenon that the higher workpieces topple due to inertia is avoided.