The robot system is composed of four parts: the mechanical arm handling system, the 3D visual positioning system, the track conveying robot system and the feeding system. The mechanical arm handling system mainly consists of the handling mechanical arm and vacuum suction cups (or grippers), using a large-load six-axis mechanical arm and vacuum suction cups. The feeding system mainly conveys polyacrylamide and alum on the trays to the corresponding receiving bins automatically through the mechanical arm, 3D industrial cameras and track cyclic conveying system.