The invention relates to a disassembly method for a tuyere-cooler casing of a blast furnace, and belongs to the technical field of blast furnace on-the-spot maintenance of the metallurgical industry.According to the technical scheme adopted by the invention, the disassembly method comprises the following steps: (1) fixing a shoulder pole beam (2) on a position, in a radial direction of the tuyere-cooler casing (6), at one end with a relatively great diameter of the tuyere-cooler casing (6); (2) separately fixing two hydraulic lifting jacks (1) at the two ends of a shoulder pole beam (2), andenabling the two hydraulic lifting jacks (1) to jack furnace bodies (4) at the two sides of a tuyere; and (3) quickly dismounting the tuyere-cooler casing (6) by utilizing acting force of the two hydraulic lifting jacks (1). The disassembly method has the beneficial effects that: the tuyere-cooler casing can be quickly dismounted from the tuyere of the blast furnace, so that the problems that theblast furnace is halted for a long time and the like due to great disassembly difficulty and long operation time during replacement of the tuyere-cooler casing are completely solved.