The utility model relates to an express mail automatic sorting device based on vision, snatch manipulator, computer and control system including fixed bolster, main belt, branch's conveyer belt, auto focus bar code reading device, CCD camera, electromagnetic clutch, express mail, branch's conveyer belt is located main belt the right, auto focus bar code reading device is located main belt's entry end, two CCD cameras are settled on the fixed bolster respectively, install driving motor below the main belt, be fixed with driving pulley on driving motor's the output shaft, tension of the transmission belt between driving pulley and from the driven pulleys, from the driven pulleys and electromagnetic clutch coaxial coupling. The utility model discloses based on the vision positioning principle, computer and control system control of manipulator accuracy snatch the express mail, damage the problem of express mail among the solution express mail sorting processes, avoid the violence letter sorting.