Oil-immersed transformer capable of preventing leakage

The oil-immersed transformer comprises a transformer body and an oil tank, the transformer is placed in the oil tank, the oil tank comprises a tank body, a tank cover, an oil conservator and a liquid inlet pipe, the oil conservator is installed on the outer side of the tank body, the oil conservator and the tank body are communicated through the liquid inlet pipe, a liquid inlet is formed in one side of the tank body, a sealing ring is installed at the position of the liquid inlet, and a sealing ring is installed at the position of the sealing ring. Cooling fins are further mounted on the periphery of the box body, a bearing part is arranged on the upper end face of the box body and used for bearing permeation oil, a circle of first oil receiving groove is formed in the bearing part, a connecting part is arranged at the upper end of the bearing part, a mounting part is arranged at the upper end of the connecting part, a second sealing gasket is arranged between the box cover and the mounting part, and the box