The invention relates to a special transformer bushing threading tool, comprising a wire guide cylinder and a silicon rubber bellmouth, wherein the wire guide cylinder is longer than a bushing; the silicon rubber bellmouth consists of a vertically through cylindrical fine-diameter mouth and a vertically through truncated-cone-shaped bellmouth; the cylindrical fine-diameter mouth is inserted into the wire guide cylinder; the radius of the lower bottom surface of the truncated cone-shaped bellmouth is at least two times that of the upper bottom surface of the truncated-cone-shaped bellmouth; a lining is inserted into the cylindrical fine-diameter mouth; and the top of the wire guide cylinder is fixed on the bushing through a bolt. The wire guide cylinder is longer than the bushing, the cylindrical fine-diameter mouth is inserted into the wire guide cylinder, and the radius of the lower bottom surface of the truncated-cone-shaped bellmouth is at least two times that of the upper bottom surface of the truncated-cone-shaped bellmouth, so that the special tool can thread a lead of a transformer coil successfully through a guide rope, the problem of high jamming probability of a past transformer bushing threading method is solved, and the work efficiency of a working site is improved. The special transformer bushing threading tool is simple in structure, convenient, practical, safe and reliable.