The invention discloses an auxiliary mounting apparatus for a drop fuse. The auxiliary mounting apparatus comprises a top plate, wherein the right end part of the top plate is fixedly connected with a cross arm; the left end of the top plate is connected with a rotary rod through a rotary shaft; the rotary rod, a fixed pulley and an insertion rod are arranged at the lower part of the top plate in sequence from left to right; the lower end of the rotary rod is connected with a connecting plate; the connecting plate is connected with the drop fuse; one end of a cable rope penetrating through the fixed pulley is connected with the connecting plate while the other end of the cable rope is connected with a side wall of a winding column; a limiting insertion hole for limiting rotation of the winding column is formed in the insertion rod; a plurality of insertion holes are uniformly formed in the periphery of each of two radial surfaces of the fixed pulley; and a telescopic insertion rod is mounted on the upper surface of the connecting plate in a manner of corresponding to the insertion holes in the periphery of each of the two radial surfaces of the fixed pulley. The apparatus is mounted between the drop fuse and the cross arm, the drop fuse can be firmly mounted on the cross arm, and a mounting angle of the drop fuse can be conveniently and flexibly adjusted according to actual needs of an operation site to ensure the drop fuse to normally work.