Oil-immersed power transformer

The utility model provides an oil-immersed power transformer, which comprises an oil tank and a radiating fin group arranged outside the oil tank, a flat radiating auxiliary box is arranged in the radiating fin group, a gap is arranged between the radiating auxiliary box and the oil tank, an oil pump is arranged outside the oil tank, one end of the radiating auxiliary box is communicated with the oil tank, and the other end of the radiating auxiliary box is communicated with the oil tank. The other end of the cooling auxiliary box communicates with the oil tank through the oil pump. According to the utility model, the oil pump is arranged and the cooling auxiliary box is additionally arranged on the cooling fin group, the oil temperature in the cooling auxiliary box can be rapidly reduced, then the cooled transformer oil is pumped into the oil tank through the oil pump, and the transformer oil entering the oil tank generates disturbance in the oil tank, so that the heat conduction speed in the oil tank is acc