The utility model discloses a cooling structure for bottom of a blast furnace. The cooling structure comprises an upper carbon brick (4) and a lower carbon brick (1) which are arranged from the top down in turn, wherein the upper portion of the lower carbon brick (1) is provided with a groove, a water cooling pipe (2) is arranged in the groove, and filler (3) is arranged in gaps between the groove and the water cooling pipe (2). The cooling device greatly shortens the transmission distance of heat energy through directly embedding the water cooling pipe in the carbon brick on the bottom of a furnace, reduces heat resistance, improves the cooling effect of the water cooling pipe, and reduces the consumption of the filler.