The invention discloses an extra-high-voltage power transmission line barrier removing robot which comprises a shell, wherein the shell is internally provided with an inner cavity; four vertical buffer rods are vertically arranged in the inner cavity; the upper ends of the vertical buffer rods penetrate out of the shell and are respectively provided with a travelling wheel motor; each travelling wheel motor is provided with a travelling wheel which is a grooved wheel; a mechanical arm is arranged on one side of the shell; a clapboard is horizontally arranged in the inner cavity; the inner cavity is internally provided with a first guide rod which is movably provided with a first sliding sleeve; the first sliding sleeve is provided with a first nut; the inner cavity is internally provided with a first motor; an output shaft of the first motor is provided with a first screw rod which is in threaded connection with the first nut. The extra-high voltage power transmission line barrier removing robot is capable of rapidly and stably spanning a spacer and a damper on an overhead line and easily passing through a straight line tower, thus being convenient to popularize and apply, being capable of completely replacing manpower to remove the waste on a power transmission line, and guaranteeing the line to be safe. The extra-high voltage power transmission line barrier removing robot also has the advantages of being simple and compact in structure, low in manufacturing cost and convenient to operate.