The invention relates to an overhead line passive measurement test wiring automatic switching circuit and an overhead line passive measurement test wiring automatic switching method, belonging to thetechnical field of switching circuits. The a test wiring circuit automatically switches different circuit states, thus induced voltages and induced currents generated in a tested circuit by other operating circuits or electrical equipment existing around the tested circuit are measured, and the resistance, inductive reactance and inter-phase mutual inductance of the tested circuit can be obtainedthrough measuring phases of voltages and currents under different conditions. The overhead line passive measurement test wiring automatic switching method utilizes an AC contactor controlled by meansof an external control device to realize automatic switching of the test wiring, avoids the disadvantages of low test efficiency, poor reliability and high safety risk caused by multiple manual changes of the test wiring, effectively improves the efficiency and reliability of performing overhead line parameter measurement by adopting the passive measurement overhead transmission line parameter technology, and reduces the test risk.