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Abstract.The application of the programmable controller in the control system of the cotton circular die forming device is described, the structure and working principle of the cotton circular die forming device are introduced, the overall plan of the cotton circular die forming device control system is proposed, and the programmable control is analyzed The working process and characteristics of the controller, at the same time, using s7-200 software for program simulation to verify that the control system program can meet the expected control requirements. And use visual studio to design the host computer to control and display the process of cotton round molding.