Oil-immersed transformer and explosion-proof structure thereof

The explosion-proof structure of the oil-immersed transformer comprises an oil tank, a gas tank and an inflation device, the oil tank comprises a plurality of tank walls, one of the tank walls is an elastic tank wall, the other tank walls are fixed tank walls, and a flange communicated with the interior of the oil tank is arranged on the elastic tank wall; the gas tank is connected to the elastic tank wall and covers the flange, the gas tank is communicated with the oil tank through the flange, and an explosion-proof membrane is mounted on the flange, so that a closed cavity is formed in the gas tank; the inflation device is located in the closed cavity and can supplement nitrogen into the closed cavity so that the closed cavity can be in a positive pressure state. The elastic tank wall provided by the utility model can deform to absorb a large amount of pressure wave energy, so that the impact force of pressure waves on the oil tank is reduced, and the explosion-proof performance of the transformer is effect