The invention discloses a reset unit for correcting the displacement of a damper on an electric transmission line. The reset unit comprises a shell, wherein a laser range finder and a striker are arranged at the front end of the shell, a strip-shaped opening is formed in the shell in the length direction, and the shell is hung on a power transmission line through the strip-shaped opening to enable the power transmission line to pass through the interior of the shell; traveling wheels are arranged in the shell and located above the power transmission line, and a locking wheel capable of moving near the power transmission line is arranged in the shell and located below the power transmission line; a signal transceiver and a controller are also arranged inside the shell, the controller is connected with the signal transceiver, the laser range finder and the striker, movement of the shell and working of the striker are controlled by a remote controller matched with the signal transceiver, and the striker can reciprocate along the power transmission line to strike the damper constantly so as to make the damper reset. The whole reset unit is controlled remotely to move, correction and operation are easy, operability is high, and safety is high.