The invention provides a test wiring circuit for line parameter measurement and a measurement method of the circuit, solves the technical problems that a three-phase different-frequency power supply used in a present measurement manner is large in size, insufficient in flexibility and low in test efficiency, and is especially suitable for measuring parameters of power transmission lines of the electrical network. A single-phase different-frequency power supply serves as an external power supply, voltage transformers PT1, PT2 and PT3, heavy-current transformers CT1, CT2 and CT3, mini-current transformers CT4, CT5 and CT6 and 12 AC contactors K1 to K12 form a circuit structure, and under external logic control, the 12 contactors can complete all test wire switching required by the test process without manual intervention.