Factory DC power supply fault monitoring system

The utility model relates to the technical field of direct-current power supplies, and provides a factory direct-current power supply fault monitoring system, which comprises a single storage battery internal resistance detection module, a main control module and a single storage battery short-circuit circuit, the single storage battery internal resistance detection module comprises a voltage sampling circuit, a phase shift detection circuit, a low-frequency alternating current power supply, a blocking capacitor C1, a sampling resistor R1 and a storage battery pack, and the low-frequency alternating current power supply, the blocking capacitor C1, the sampling resistor R1 and the storage battery pack form a closed loop. The output end of the voltage sampling circuit is connected with the input end of the phase shift detection circuit, the output end of the phase shift detection circuit is connected with the main control module, the main control module is connected with the input end of the single storage batt