The present invention relates to a transformer protection device. The transformer protection device comprises a first protection structure and a second protection structure, the transformer comprisesan iron yoke formed by a core extended out of a coil, the first protection structure is arranged at the iron yoke, and the shapes of the first protection structure and the iron yoke are matched to shield the coil. The second protection structure is arranged at the end portion of the coil. The transformer protection device in the embodiment of the invention is provided with the first protection structure in the iron yoke to prevent metal foreign matters from falling into the transformer by passing through the iron yoke. The end portion of the coil is provided with the second protection structure which can prevent the metal foreign matters from entering the internal portion of the coil. Therefore, the problem that partial discharge caused by allowing metal foreign matters to enter the transformer in the running process of the transformer causes acceleration of aging of the insulating materials in a voltage device and even cause damaging of the transformer is solved, and the transformer protection device facilitates prolonging of the service life of the transformer.