The utility model provides a circulating fluidized bed boiler is fluidizing air device for limestone flour conveying system, during limestone flour pipeline is sent limestone flour into through the rotary feeder in the bottom of limestone flour feed bin, and in saying with the help of compressed air pipe that the compressed air that goes into to drum in the limestone flour pipeline carries the circulating fluidized bed boiler with limestone flour, the fluidizing air device is including setting up the fluidizing air air distribution plate that sets up in limestone flour storehouse bottom and tothe industry tuber pipe line of sending into fluidizing air in it, be provided with electric heater on the industry tuber pipe line. The utility model discloses the effect of fluidizing air air distribution plate is mainly played the uniform flow and is turned usefulness into, forms even gas -solid two -phase flow in limestone flour storehouse bottom, prevents the not unloading of putting up a bridge of storehouse bottom limestone flour, the adjustable heating power of electric heater for control fluidizing air's temperature sets up air distribution plate hand valve before the fluidizing airair distribution plate, be used for the volume of controlling fluidizing air.