Generator excitation small current detection device

The invention relates to the technical field of excitation systems, and discloses and provides a generator excitation small current detection device, which comprises a box body, and a detection system and a controller which are arranged in the box body, the detection system comprises a three-phase AC power supply, a three-phase transformer, a fuse, a power cabinet, a dummy load, an oscilloscope and a universal meter. The input end of the three-phase alternating current power supply is connected with the input end of the three-phase transformer through the air switch; the output end of the three-phase transformer is connected to the jack terminal of the test wire through the fuse. The voltage output by the three-phase transformer is connected to the anode side of the power cabinet through the test wire; the cathode side of the power cabinet is connected to the dummy load loop through a fuse. The two ends of the dummy load are connected in parallel with an oscilloscope and a universal meter. According to the in