Flange connection protection device capable of preventing seawater impact

The utility model relates to the field of offshore wind power generation, in particular to a seawater impact prevention flange connection protection device which comprises an upper protection cover and a lower protection cover, the upper protection cover and the lower protection cover are the same in structure, the upper protection cover and the lower protection cover are in up-down butt joint to cover the outer surface of a flange, and the upper protection cover and the lower protection cover are detachably connected. A plurality of matched through holes are formed in the upper protection cover and the lower protection cover, the two ends of the steel wire rope are detachably connected with the steel wire rope nuts through the through holes, and the number of the steel wire rope nuts is matched with the number of the through holes. The transverse shearing force is borne, so that the J-shaped pipe and the flange connecting port are protected, the bolt connected with the flange connecting port cannot be loosen