Cooling device for traction transformer of motor train unit

The invention belongs to the field of cooling devices, and particularly relates to a cooling device for a traction transformer of a motor train unit. Aiming at the problems that a great amount of heatcan be generated after an existing motor train unit traction transformer works for a long time and the heat is inconvenient to dissipate to affect service lifetime of the transformer, the following scheme is proposed. The cooling device comprises a transformer body, wherein a displacement plate is arranged in the transformer body in a sliding way, two plug plates are fixedly arranged at the top of the displacement plate, two first cooling holes are formed in the top of the transformer body, the plug plates are clamped with the first cooling holes, a vertical rod is welded with the tops of theplug plates, top ends of the vertical rods extend to a part above the transformer body, and a push plate is welded between the two vertical rods and is arranged above the same transformer body. The cooling device is good in practicability, the first cooling holes and a second cooling hole can be simultaneously opened, the transformer body is cooled, and the cooling device is simple to operate.