An operation method of a burner device for high-temperature air combustion, the burner device for high-temperature air combustion comprising: a thermal insulation portion that is provided facing a furnace and has a throat; a burner nozzle that is provided at the axial center of this throat and that injects a pulverized coal mixed flow into the furnace through the throat; a windbox that is provided so as to house this burner nozzle; an air register that is provided at the distal end of the burner nozzle and that injects low-temperature secondary air from the windbox to the throat; a high-temperature air nozzle, one end of which opens into the furnace through the thermal insulation portion while the other end opens into the windbox; and a combustion air switching means that switches between injecting low-temperature secondary air to the throat through the air register and injecting high-temperature secondary air to the furnace interior through the high-temperature air nozzle, the burner device for high-temperature air combustion further comprises a secondary air temperature adjusting means that extracts exhaust gas and mixes it with secondary air flowing into the windbox to adjust the temperature of the secondary air, characterised in that in steady combustion, low-temperature secondary air is injected to the throat through the air register by the combustion air switching means and a pulverized coal mixed flow is injected from the burner nozzle, and in high-temperature air combustion, high-temperature secondary air is injected to the furnace interior through the high-temperature air nozzle by the combustion air switching means and a pulverized coal mixed flow is injected from the burner nozzle, wherein in the state of this secondary air temperature adjusting means not mixing exhaust gas with the secondary air, the combustion air switching means closes the high-temperature air nozzle, and injects the secondary air via the air register, and in the state of the secondary air temperature adjusting means mixing exhaust gas with the secondary air, the combustion air switching means closes the air register, and injects the high-temperature secondary air via the high-temperature air nozzle. a thermal insulation portion that is provided facing a furnace and has a throat; a burner nozzle that is provided at the axial center of this throat and that injects a pulverized coal mixed flow into the furnace through the throat; a windbox that is provided so as to house this burner nozzle; an air register that is provided at the distal end of the burner nozzle and that injects low-temperature secondary air from the windbox to the throat; a high-temperature air nozzle, one end of which opens into the furnace through the thermal insulation portion while the other end opens into the windbox; and a combustion air switching means that switches between injecting low-temperature secondary air to the throat through the air register and injecting high-temperature secondary air to the furnace interior through the high-temperature air nozzle, the burner device for high-temperature air combustion further comprises a secondary air temperature adjusting means that extracts exhaust gas and mixes it with secondary air flowing into the windbox to adjust the temperature of the secondary air, characterised in that in steady combustion, low-temperature secondary air is injected to the throat through the air register by the combustion air switching means and a pulverized coal mixed flow is injected from the burner nozzle, and in high-temperature air combustion, high-temperature secondary air is injected to the furnace interior through the high-temperature air nozzle by the combustion air switching means and a pulverized coal mixed flow is injected from the burner nozzle, wherein in the state of this secondary air temperature adjusting means not mixing exhaust gas with the secondary air, the combustion air switching means closes the high-temperature air nozzle, and injects the secondary air via the air register, and in the state of the secondary air temperature adjusting means mixing exhaust gas with the secondary air, the combustion air switching means closes the air register, and injects the high-temperature secondary air via the high-temperature air nozzle.