The invention discloses a transformer station grounding device characteristic parameter detection verification system including a grounding impedance test circuit, wherein the grounding impedance test circuit includes terminals C2, P2, P1 and C1, the C2 is connected with one end of a standard resistor change-over switch K3 via a first channel of an series-connected impedance test master switch K1, a current pole resistor change-over switch K2 and a current pole simulating resistor, P2 is connected with one end of a power frequency interference switch K4 in a second channel of the series-connected impedance test master switch K1, the other end of the K4 has two contacts, the first contact is connected to one end of a voltage pole resistor change-over switch K5 via an isolation transformer T, the second contact is directly connected to one end of the K5, the other end of the K5 is connected to one end of the K3 through a voltage pole simulating resistor, the other end of K3 is connected to one end of standard resistor Re, and the other end of the Re is connected with the panel terminals P1 and C1. The transformer station grounding device characteristic parameter detection verification system can detect the test properties of a grounding measuring instrument on the market, and can judge the test performance indexes of the detection instrument and ensures the accuracy and safety of the grounding grid performance measurement.