The utility model relates to a tool for transformer bushing threading. The tool for transformer bushing threading comprises a thread-guiding cylinder and a silicone rubber horn, the length of the silicone rubber horn is larger than the length of a bushing, the silicone rubber horn is composed of a cylindrical thin-diameter port and a circular-truncated-cone horn, wherein the upper portion and the lower portion of the cylindrical thin-diameter port are communicated and the upper portion and the lower portion of the circular-truncated-cone horn are communicated, the cylindrical thin-diameter port is inserted in the thread-guiding cylinder, and the radius of the lower bottom face of the circular-truncated-cone horn is at least two times of the radius of the upper bottom face. A liner is arranged in the cylindrical thin-diameter port in an inserted mode. The upper portion of the thread-guiding cylinder is fixed on the sleeve through bolts. According to the tool for transformer bushing threading ,the length of the thread-guiding cylinder is larger than the length of the bushing, the cylindrical thin-diameter port is inserted in the thread-guiding cylinder, the radius of the lower bottom face of the circular-truncated-cone horn is at least two times of the radius of the upper bottom face, the tool for transformer bushing threading can guide leads of a transformer coil out smoothly through a guiding rope, solves the problem that transformer bushing threading is easy to clamp in the prior art, improves working efficiency of operation site, and is simple in structure, convenient and practical, and safe and reliable.