Overhead transmission line inspection robot

The invention provides an overhead transmission line inspection robot which comprises a case, one end of the case is rotatably connected with a mounting rack, the mounting rack is slidably connected with a track, a supporting arm is arranged above the case, the supporting arm is provided with a mounting groove, a sliding block and a lead screw are slidably connected in the mounting groove, and the sliding block is provided with a cavity. A spring is arranged in the cavity, a connecting block is arranged on the outward side face of the sliding block, a rotating shaft is connected to the connecting block, pressing wheels are symmetrically arranged on the mounting plate, a mounting box is arranged at the top of the supporting arm, a power device is arranged in the mounting box, and the power output end of the power device penetrates through the mounting box and is connected with a driving wheel. When obstacles such as a pre-twisted wire, a splicing sleeve and an armor rod exist on the electric wire, the spring i