The invention discloses a grounding fault detection apparatus. The grounding fault detection apparatus comprises a signal generating device, a signal acquisition device and a signal receiving device. According to the grounding fault detection apparatus of the invention, the signal generating device is adopted, so that detection signals can be transmitted to a fault line; the signal acquisition device is adopted, so that the detection signals can be acquired from the fault line, and therefore, a fault point can be determined; and the signal receiving device is adopted, so that the position information of the fault point can be emitted out; and therefore, the fault point can be accurately positioned.