Abstract: Suspension chain transportation is an important link in the process of engine block casting transfer, Aiming at the problems of low production efficiency, high labor intensity, hidden safety risks and knock and tear caused by the artificial pendant in the existing process, a robot movable pendant system based on visual recognition was designed. The system uses visual recognition technology and robot tracking technology to realize the suspension chain in the motion of 300 kg heavy load cylinder automatically grab the pendant. The system has been put into use, operation is stable and reliable, the robot effectively replaces the manual, the production efficiency is increased by 10%, and the rejection rate due to the knock and bump of castings is reduced to below 0.4%, which has a good application prospect.