Corrosion-resistant blast furnace gas heat exchanger

The utility model discloses a corrosion-resistant blast furnace gas heat exchanger comprising a heat exchanger inlet end, a heat exchanger outlet end, a heat exchanger box body and a heat exchanger tube bundle, wherein the heat exchanger inlet end and the heat exchanger outlet end are arranged on two sides of the heat exchanger box body respectively; the heat exchanger tube bundle is arranged in the heat exchanger box body; a first anticorrosive coating is arranged on the outer wall of the heat exchanger tube bundle; a second anticorrosive coating is arranged on the inner wall of the heat exchanger box body; a third anticorrosive coating is arranged on the upper surface of a bottom plate of the heat exchanger box body; a filling layer is arranged in an interlayer of the bottom plate of the heat exchanger box body. The corrosion-resistant blast furnace gas heat exchanger disclosed by the utility model starts from different corrosion mechanisms of the gas heat exchanger, and adopts designs of the anticorrosive