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Abstract. Cotton round molding is an important part of the efficient harvesting process of cotton. China is a big cotton country in the world. Compared with developed countries, most of China's cotton picking is harvested by manpower, with high harvesting cost, high labor intensity and low efficiency, which largely restricts the development of China's cotton industry. The paper mainly focuses on the position detection and film-free warning circuit design of the film storage material in the cotton round molding machine, and supplements and perfects the previous design and research of the cotton baler by the team led by the instructor. The original intention of the design was that when the cotton picker was working in the field, the driver could not intuitively judge the remaining amount of cotton film in the cotton baler and the cotton output in a certain period of time, so the driver was obtained by designing the detection circuit and communicating with the host computer. Picking information. This design mainly focuses on the STM32F103VET6 large-capacity single-chip microcomputer to realize the control of signal acquisition, arithmetic processing and communication. The remaining amount of cotton film is detected by a pressure sensor, and the pressure is converted into the remaining amount of the cotton film. The cotton production capacity can be recorded by the QR code scanning module to record the total output of cotton without a bundle of film. The executive module consists mainly of a buzzer and a hydraulic system. These parts are coordinated through programming to achieve design requirements