A device for reducing the burning temperature of a pure-oxygen tuyere in a smelting reduction ironmaking technology comprises a first cooled coal gas pipeline, a second cooled coal gas pipeline, a second cooled coal gas compressor and a cooled coal gas pipeline, wherein the first cooled coal gas pipeline is led out of a smelting gasifier and comprises a hot cyclone dust collector, a coal gas washer and a first cooled coal gas compressor; an inlet end of the second cooled coal gas pipeline is connected to an outlet pipeline of the first cooled coal gas compressor; the second cooled coal gas compressor is arranged in a second cooled coal gas pipeline; the cooled coal gas pipeline is arranged in a tuyere oxygen lance at the lower part of the smelting gasifier, and an outlet of the cooled coal gas pipeline corresponds to a tuyere cyclone area of the smelting gasifier; an outlet end of the second cooled coal gas pipeline is connected to an inlet end of the cooled coal gas pipeline; and a one-way valve is arranged in a pipeline close to the outlet end of the second cooled coal gas pipeline. With the adoption of the device for reducing the burning temperature of the pure-oxygen tuyere in the smelting reduction ironmaking technology, on the premise that inert gas N2 in the coal gas is not increased, the theoretical burning temperature of the front end of the tuyere is reduced through utilizing the cooled coal gas generated by the device, so that the work environment where the tuyere is located is improved, the damage to the tuyere is reduced, the silicon reduction is reduced, and the quality of molten iron is improved.