In recent years, punching technology of our country is developing fast. The proportion of hand feeding punching processing has gradually been replaced by automatic feeding and unloading mechanism, due to the low efficiency, poor security. In this paper, we design an automatic feeding and unloading system of the punching sheets of motor. The rotary manipulator consists of the transmission device, the mechanical arm device, the material suction device, the raw material automatic lifting device and so on. Adopting the rodless cylinder as the main actuator, the system realizes these beat movements of continuous lifting up, centering, conveying, unloading. According to the working principle and mechanical structure of the components in the system, the function and application of each component in the whole feeding-and-unloading system are analyzed in this paper. In the past years, punching technology of our country is developing fast. The proportion of hand feeding punching processing has been been replaced by automatic feeding and unloading mechanism, due to the low efficiency, poor security. In this paper, we design an automatic feeding and unloading system of the punching sheets of motor. The rotary manipulator consists of the transmission device, the mechanical arm device, the material suction device, the raw material automatic lifting device and so on. Adopting the rodless cylinder as the main actuator, the system realizes these beat movements of continuous lifting up, centering, conveying, unloading. According to the working principle and mechanical structure of the components in the system, the function and application of each component in the whole feeding-and-unloading system are analyzed in this paper .