The invention discloses a safe foreign matter clearing device used for line maintenance. The device comprises a hollow insulation rod, wherein the inner wall of the insulation rod is in sliding connection with a hollow expansion rod; the inner wall of the expansion rod is in threaded connection with a rotation lead screw; the lower end of the rotation lead screw is rotatably connected in a bearingbush through a bearing; the bearing bush is connected with a cover plate through a bolt; the bottom of the cover plate is provided with a handle vertical to the cover plate; the top end of the expansion rod is connected with a battery cabin; the top of the battery cabin is connected with a C-shaped bracket; the C-shaped bracket is connected with the output end of a motor through a horizontal rotation shaft; the rotation shaft is provided with a plurality of fixing blocks at equal intervals; a cleaning rod is fixed on each fixing block through a bolt; a plurality of rubber bulges are formed onthe outer surface of each cleaning rod; a rubber ball is formed on the end part of each rubber bulge; and the upper surface of the C-shaped bracket is provided with a concave arc-shaped blade. By useof the device, through the concave arc-shaped blade and an anchor-shaped hook, foreign matters can be cut and pulled so as to achieve a purpose of clearing foreign matters, dust on an electric wire can be cleaned through a dust cleaning device, and therefore, a purpose of line maintenance is achieved.