Cooling system of blast furnace

The invention provides a cooling system of a blast furnace. The cooling system comprises a first cooling circulating system, a second cooling circulating system, a furnace bottom cooling pipe assembly and a furnace cylinder cooling wall pipe assembly, wherein the furnace bottom cooling pipe assembly is mounted in a furnace bottom of the blast furnace; a first-stage cooling pipe and a second-stage cooling pipe are arranged in the furnace bottom cooling pipe assembly; the first-stage cooling pipe and the second-stage cooling pipe are separately connected with the first cooling circulating system and the second cooling circulating system; the furnace cylinder cooling wall pipe assembly is mounted in a cooling wall of the blast furnace; a first coiled pipe and a second coiled pipe are arranged in the furnace cylinder cooling wall pipe assembly; and the first coiled pipe and the second coiled pipe are separately connected with the first cooling circulating system and the second cooling circulating system. Accordin