The utility model relates to the technical field of pipeline water dredging, and particularly discloses a water guide device for dismounting a pipeline. The utility model discloses a water guide device for dismounting a pipeline. The device comprises a transparent waterproof flexible material and nylon hasps, the nylon hasps are installed at the upper end and the lower end of a flexible shell formed by the transparent waterproof flexible material, and the transparent waterproof flexible material wraps a to-be-disassembled pipeline or is removed from the to-be-disassembled pipeline through a water-gas sealing waterproof zipper arranged on the transparent waterproof flexible material; the nylon hasps at the upper end and the lower end of the transparent waterproof flexible material can be hermetically fixed at a to-be-disassembled pipeline; and a plurality of tool channels and water outlets are formed in the side wall of the flexible shell made of the transparent waterproof flexible material. According to the water guide device for dismantling the pipeline, the characteristic that water flows in the gravity direction can be utilized, the whole flange position is wrapped by waterproofmaterials, then dismantling operation is conducted, residual water in the pipeline can be controlled in the waterproof materials, and the water is guided to a reasonable area through the water outlet.