The invention provides a line dropping operation device used for a double-head tackle and a processing method for foreign matters on a lead. The device comprises an unmanned aerial vehicle and a grabber which is connected with the unmanned aerial vehicle. The grabber comprises a steering engine and two clamping mechanisms which are oppositely and symmetrically arranged at the two sides of the steering engine. The unmanned aerial vehicle can control on/off of the steering engine. Each clamping mechanism comprises at least one group of a rotating joint and a clamping claw which are connected from the top to the bottom. One end of the rotating joint can be rotatably connected with the steering engine, and the other end of the rotating joint can be rotatably connected with one end of the clamping claw. The other end of the clamping claw extends to the center line of the steering engine. The steering engine drives all the rotating joints to rotate so as to drive the other end of each clamping claw to gradually contract to the inside to penetrate through hooks and hang on the double-head tackle. The steering engine drives all the rotating joints to reversely rotate so as to drive the other end of each clamping claw to stretch to the outside and separate from the hooks. The double-head tackle can conveniently reach any position so that the efficiency of removing the foreign matters can be enhanced and artificial tower climbing can be avoided.