Threaded rod breaking prevention tool for fine tungsten threaded rod machining harness cord

The utility model discloses a tool for preventing a screw from being broken off for a fine tungsten screw machining harness cord, the tool for preventing the screw from being broken off comprises an elastic chuck, a connecting column and a wedge-shaped rod which are connected in sequence, the elastic chuck is rotatably connected with the connecting column, and the wedge-shaped rod is fixedly connected with the connecting column; a first through hole, a second through hole and a third through hole which are consistent in axis are formed in the middle of the elastic chuck, the middle of the connecting column and the middle of the wedge-shaped rod respectively, the diameter of the first through hole is matched with that of the thin tungsten screw, the diameter of the second through hole is consistent with that of the third through hole and is not smaller than that of the first through hole, and the outer surface of the elastic chuck can be in threaded connection with a nut. The elastic chuck can clamp the thin t