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In SMT printing, the flatness of steel mesh is an important factor that affects the quality of SMT printing. The flatness of steel mesh is determined by measuring the surface tension of the four corners and the middle positions of the steel mesh. There are two kinds of surface tension measuring instruments: pointer type and digital type. At present, there is no on-line measuring system for tension of SMT steel mesh. The design of surface tension measuring system based on capacitance displacement sensor is of practical significance for improving the quality of SMT printing. The capacitance sensor is composed of static ruler and moving ruler. The tiny displacement of moving ruler caused by surface tension changing causes the capacitance changing between static ruler and moving ruler. The MCU （GC7626）changes the capacitance signal to digital signal，the accuracy is up to 1N/cm. In this paper, the STM32F103C8T6 is used master controller, the STM32F103C8T6 system reads the tension data from GC7626, and stores the information in RFID of SMT steel mesh. The STM32F103C8T6 system transmits the tension data and the information data of the steel mesh to the mobile phone(or PC) by the Bluetooth. APP is designed in the mobile phone(or PC) to process the tension data and realize the online detection of the tension of the steel grid. This system solves the core problem of intelligent management of steel grid production.The system has been successfully applied in industrial production to realize the on-line detection and intelligent management of the surface of the steel mesh.