The invention discloses a foreign matter removal apparatus for a high-voltage power transmission line. The foreign matter removal apparatus comprises a supporting plate; connecting plates are arranged on the top parts of the two ends of the supporting plate respectively; walking wheels are arranged on the top parts of the two connecting plates; a walking motor is also arranged on one connecting plate; horizontally-rotating circular cutters are arranged on the left and right sides of the top of the front end of the supporting plate respectively; a cutter motor is arranged at the bottom of the supporting plate; cutter overlapping parts which are overlaid up and down and are arranged at intervals are arranged between the two circular cutters; a foreign matter inlet which extends from the front side surface of the supporting plate to the place below the cutter overlapping region is formed in the front end of the supporting plate; a supporting shaft is also arranged between the top parts of the two connecting plates; swinging bases positioned on the left and right sides of a wire are hinged in the middle part of the supporting shaft; and supporting wheels, which prop against the outer surface of corresponding one side of the wire, are arranged at the front and back ends of each swinging base respectively, and a cleaning wheel used for cleaning foreign matter which is wound around the wire is arranged in the middle part. By adoption of the foreign matter removal apparatus, foreign matters of different sizes on the wire can be removed rapidly and completely.