This product is installed inside the tower cylinder of the wind turbine engine room, which can reduce the area of the whole equipment. Meanwhile, for offshore wind power station, the high position of the engine room can solve the problem of protection problems caused by the low installation position of the step-up equipment. In order to be applicable to the severe weather and environmental conditions when operating in the wind power engine room, the transformer has the characteristics of strong anti-corrosion and anti-vibration ability. Considering the limitation of engine room size, this product installed in the engine room is highly feasible, reliable and maintainable. At the same time, the transformer has high insulation strength, strong short circuit resistance and convenient maintenance, which provides a strong guarantee for the stable operation of offshore wind power generation transformers.