Manhole device of 110 kV power transformer

The invention discloses a manhole device of a 110 kV power transformer. The manhole device of the 110 kV power transformer comprises a manhole flange, a manhole cover plate and a sealing gasket; the power transformer is provided with an oil tank; the manhole flange is welded to the tank wall of the oil tank; the manhole cover plate is arranged on the manhole flange in a covering manner; the sealing gasket is arranged between the manhole cover plate and the manhole flange; the manhole cover plate is connected with the manhole flange through a fixing assembly; the fixing assembly comprises a fixing bolt, a flat washer and a spring washer; the fixing bolt sequentially penetrates the spring washer, the flat washer, the manhole cover plate and the manhole flange, and the manhole cover plate and the manhole flange are fixedly connected together; and the manhole cover plate is provided with a handle. When the transformer is manufactured or overhauled, the fixing bolt can be screwed out, the manhole cover plate is op