The invention relates to a coal powder high temperature preheating method which relates to the technology of coal powder combustion. The coal powder is added in the middle and lower part of the firebox of an insulating circulating fluid bed and little air is conducted in the bottom part; a part of the coal powder is burnt. The coal powder is heated to between 800 DEG C and 1300 DEG C and the hightemperature coal powder enters a cyclone separating device with the flue gas; a part of the coal powder is collected by the cyclone separating device and returned to the firebox through a material returning device; the rest coal powder is sprayed into an inflamer of a coal powder boiler with the flue gas to burn. The invention has the advantages of broad application, good combustion stability andcan also cooperate with a classified air distribution technology to control the uniformities of the temperature level and distribution of a furnace, thereby greatly reducing the exhausting of NOx.