The utility model discloses a rectifier transformer which comprises an iron core, a primary side winding and a vice side winding. The rectifier transformer is characterized by further comprising redundancy unit sections. The vice side winding comprises a plurality of unit sections, wherein the plurality of unit sections are arranged in a ranked mode in sequence along the axial direction of the vice side winding. The redundancy unit sections are arranged on the upper side or the lower side of the vice side winding or arranged between any two unit sections and used for replacing faulted unit sections on the vice side winding. Due to the fact that the redundancy unit sections can directly replace the faulted unit sections, the continuous power supplying of a whole electric distribution system can be maintained.