The utility model discloses an overhead line parameter measuring line connecting device. The device comprises a three-phase high-voltage lead interface, a main diverter switch, three induction voltage lead-out measuring pile heads, three alternating-current voltage meters, a direct-current voltage meter, a direct-current current meter, three air switches and a rectifying device. The three-phase high-voltage lead interface is formed in the rear side of a box body, and used for introducing an overhead line, the main diverter switch is arranged above a device panel, and switching of the overhead line induction voltage and direct-current resistance parameter measuring function can be achieved. The induction voltage lead-out measuring pile heads are arranged on the left side of the device, can be externally connected with an instrument for achieving the measuring function, the alternating-current voltage meters can be used for measuring the induction voltage, the direct-current voltage meter and the direct-current current meter can be used for measuring voltage and current in a direct-current resistance measuring loop, the air switches are used for achieving selection of a direct-current measuring loop, and the rectifying device achieves conversion of the alternating current and the direct current, and is used for completing direct-current resistance measuring. The device can solve the problem that in the prior art, line connecting and replacing are complex.