The invention belongs to the technical field of fire-fighting fireproof equipment, and particularly relates to a cylindrical rotary opening fire-fighting fireproof valve. The valve comprises a valve body, a first supporting rod, a second supporting rod, a first rotary baffle, a second rotary baffle, a third rotary baffle, a sealing limiting plate, a rotary shaft, a motor and a transmission component. The motor drives the rotary shaft to rotate, then the second rotary baffle and the third rotary baffle are driven to rotate, in the process, the rotary shaft drives a first limiting pin to rotate,the first limiting pin drives a second limiting pin to rotate through springs, and the second limiting pin drives the second rotary baffle to rotate. When one side of the third rotary baffle is inserted into a first groove in the sealing limiting plate, the fireproof valve is closed, high-temperature flue gas is prevented from entering a pipeline, the high-temperature flue gas is prevented from entering other rooms through the pipeline, fire disasters in the other rooms are avoided, a fire disaster area is isolated, and fire spreading is avoided; and the losses caused by fire disasters to personal and property safety are further reduced.