The utility model discloses a high -voltage line foreign matter shearing mechanism, what be provided with tandem arrangement on the main part support is used for hanging the pulley of leading on the wire, the pulley of leading follow the pivot of being fixed in both sides limit around the main part support and rotate, lead around be provided with respectively in the pivot of pulley first, the 2ndsynchronous pulley, the outside at the long side of main part support is provided with gear motor, gear motor's output shaft passes the long side of main part support, be provided with the 3rd synchronous pulley on lieing in the inboard output shaft of the long side of main part support, it is first, second and the 3rd synchronous pulley utilize and bring capable transmission into, top at the mainpart support is provided with guide bracket, be provided with on guide bracket and be used for adsorbing the magnet on unmanned aerial vehicle, the middle and upper position department of putting atthe long side of that one end main part support of pulley of leading the way installs foreign matter cutting device. The utility model discloses simple structure is fit for promoting.