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In order to ensure the working efficiency of the current sensor and provide an effective reference for equipment maintenance, the current sensor fault monitoring system is optimized and designed using the sliding mode observer. Add a sliding mode observer, refit data collectors, signal processors and other equipment, adjust the circuit connection mode of the system, and complete the optimal design of the hardware system under the constraints of anti-interference. According to the working principle and fault characteristics of the current sensor, the fault mathematical model of the current sensor is constructed. Using the sliding mode observer and its logic principle, the running signal of the current sensor is collected in real time. According to the fault characteristics of the sensor, the fault monitoring index of the current sensor is selected and calculated, and the visual fault monitoring result of the current sensor is output by comparing with the set fault standard. Through the system test experiment, it is concluded that the index monitoring error, fault type false detection rate and missed detection rate of the current sensor fault monitoring system based on the sliding mode observer are all lower than the preset values, which proves that the optimal design system has good fault monitoring. Function.