The invention relates to a device for locally changing the shell of a large smelting blast furnace in a limited space, belongs to large smelting blast furnaces, and particularly relates to maintenance of shells of large smelting blast furnaces. The device comprises a holding platform and an annular beam, wherein the holding platform is arranged on the 180-degree position of a smelting blast furnace, and the annular beam is horizontally arranged in a frame; the holding platform is provided with a lower frame and is formed by erecting upper columns which are adjacent to the lower frame and away from the columns of a casting house; side main beams at two ends of the holding platform are connected with the columns of the lower frame; and two ends of a main truss are connected with the knots of the columns of the casting house by two-way sliding bases. By adopting the device provided by the invention, large-tonnage large-size equipment can be successfully hoisted and changed in a limited space.