In order to improve the automation level of cement bagging process and reduce the excessive dependence on manual bagging for a long time, an automatic bagging control system is designed based on the existing rotary cement packaging machine technology. This paper briefly expounds the structural principle of bagging device, defines the design key points of control system, and decides to adopt the hierarchical control structure of "HMI + PLC". On the basis of hardware selection, the control program and configuration interface are developed. The field experiment shows that the control system mentioned in this paper is simple, reliable, stable and easy to maintain. It runs well in the environment with high dust concentration, which can effectively realize the automatic control of bag supply, bag taking, bag opening and bag bagging. The bagging speed is close to 1 500 bags/h, and the success rate of bag bagging is 98%. The system completes the remote control through the touch screen interface, liberates the bagging workers from the harsh dust environment, provides a reference scheme for tackling the technical problems of automatic bagging, improves the automation level of cement production industry, and has broad application prospects.