The invention relates to a high temperature fluid bed combustion device in the energy resource field. The device comprises a furnace, an inclined uneven air distribution plate, a low speed primary air chamber, a high speed primary air chamber, an air classification deslagging pipe, a secondary air inlet opening, a material inlet opening, classifying air pipes and a deslagging opening. The connection relations are that the inclined uneven air distribution plate is arranged at the bottom of the furnace, the low speed primary air chamber and the high speed primary air chamber are arranged under the inclined uneven air distribution plate, the low speed primary air chamber is positioned under the lower end position of the inclined uneven air distribution plate, the high speed primary air chamber is positioned under the higher end position of the inclined uneven air distribution plate, the secondary air inlet opening is arranged on the upper part of the furnace, the material inlet opening is arranged on the furnace wall close to the low speed primary air chamber, the deslagging opening is positioned at the crossing position of the lower end of the inclined uneven air distribution plate and the furnace wall, one end of the air classification deslagging pipe is connected with the deslagging opening, the classifying air pipes are arranged on the two sides of the air classification deslagging pipe, and the classifying air pipes are communicated with the air classification deslagging pipe. The device of the invention is simple, the investment expense is low, the reliability is high, the overall combustion reaction speed is enhanced, and the fly ash carbon content is reduced.