Sealing structure and method for ventilation connection pipe of transformer

The invention relates to a sealing structure and method for a ventilation connecting pipe of a transformer, and belongs to the technical field of transformer manufacturing processes. According to the technical scheme, the device is arranged at the end of the ventilation connecting pipe and comprises a cover plate (1), a protection plate (2) and a plug (3), the cover plate (1) is of a circular structure, the cover plate (1) is provided with the protection plate (2) in the circumferential direction to form a containing cavity, a flange plate at the end of the ventilation connecting pipe is arranged in the containing cavity, and the cover plate (1) is connected with the flange plate; a plug (3) is arranged in the middle of the cover plate (1), a plurality of layers of waterproof edges (4) are arranged on the plug (3), and the plug (3) is inserted into the ventilation connecting pipe. The connecting pipe has the beneficial effects that the manufacturing cost is low, mounting of a sealing rubber mat and a bolt is