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A detection system for detecting the abnormal voltage state of the power metering device is designed for the problem of abnormal voltage of the power metering device. The system first samples the voltage and current information of the detecting device, and then inputs the collected voltage and current information to the amplifying unit for information amplification. The amplifying unit outputs the amplified information to the A/D conversion unit for analog-to-digital conversion, and the A/D conversion unit outputs the output signal to the STM32F407VGT6 computing unit for calculation and analysis. An analog switch is also connected to the STM32F407VGT6 computing unit to implement multiplexed acquisition, which effectively saves material resources and reduces the hardware usage area. The system designed in this paper can also realize the long-distance transmission of data, so that the higher-level management system can obtain the underlying detection data in real time, which helps the user to grasp the overall operation of the power metering device in time. Through the test, the results show that the accuracy of the detection data of the system reaches 100%, which meets the design and use requirements, and has strong practicability.