Transformer winding reel structure

The utility model discloses a transformer reel structure, which is a hollow pipe and provided with a plurality of separators. At least one crossover line groove, used for accepting the coil to cross over the separator, is arranged on the separator. The crossover line is inclinedly connected with the separator to increase the wiring distance of the coil. And the depth of the crossover line groove presents an inclined or a ladder state, of which one side is higher and the other side is lower. The wiring will enter from the higher side and go out from the lower side, so as to increase the relative distance between the two neighboring coils of the separator. Therefore, the withstand voltage of the reel separator can be effectively increased. Comparatively, the thickness of the reel separator is reduced, and the volume of the transformer is decreased.