Flood prevention drainage device of transformer substation

The utility model belongs to the technical field of drainage devices, and discloses a flood prevention drainage device of a transformer substation, which comprises a transformer substation equipment box, the right end of the transformer substation equipment box is movably connected with a sealing door, the left end of the sealing door is provided with a placing groove, and a sealing air bag is placed in the middle of the placing groove. The right end of the sealing air bag is fixedly connected with an air conveying pipe. Gas in the gas conveying bag moves towards the interior of the gas conveying pipe, a gap is formed in the attaching position of the sealing body and the second fixing ring, and therefore the gas conveying pipe is communicated with the interior of the sealing gas bag and the interior of the second connecting body, that is, gas in the second connecting body enters the interior of the sealing gas bag; the placing groove is attached to the transformer substation equipment box after expansion, so