A foreign matter clearer used for a conductor and a ground wire of an electric power line, is characterized by comprising a combustor and a support frame, wherein the combustor is fixedly connected with the support frame, the support frame comprises a support, a wire passing pipe is arranged in the support and fixedly connected with the support, when the foreign matter clearer is in use, an insulating endless rope passes through the wire passing pipe, two ends of the insulating endless rope are respectively connected with a force application ring and a propeller racing, the propeller racing drives the foreign matter clearer to move to the position near the foreign matter, then fuel is ignited, the insulating endless rope is pulled, and the combustor is rotated to the position of the foreign matter for igniting the foreign matter.