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In order to ensure the safety of the flight test of the shooting range, the security control system has been successfully applied in many important target drone projects. The security controller is the core component of the security control system. At present, the ground detection is mainly performed manually, which is time-consuming, labor-intensive, and inefficient, and the detection results are easily affected by human factors. Based on the signal threshold technology, this paper designs a one-button, fully automatic security controller detection system scheme. The hardware uses STM32F767ZIT6 as the main control chip, and designs the motherboard, serial board and power board by expanding the ADAS3022 analog-to-digital conversion chip, serial port conversion chip, signal conditioning and other peripheral circuits, and developed the automatic detection equipment of the security controller; The software has designed modules such as hardware bottom driver, power supply control, interface information simulation, function detection and fault alarm, which realizes the automatic detection of the security controller; Through the detection of a certain type of security controller and the artificial fault injection test, the results show that the system works in a stable state, can realize one-button automatic detection, and the detection results are credible. It can replace the tedious manual detection method and has certain prospect of engineering applications.