The invention provides a fluidized grain dust removing system which comprises a charging hopper, a material storage pot, a screwed feeder and a material even mixing pot which are sequentially connected from the top down and fixed on a steel bracket, wherein a cylinder body of the material storage pot is divided into an upper part and a lower part, the upper part is cylindrical, and the lower part is of an inverted cone shape; an upper sealing head of the material storage pot is connected with an outlet of the charging hopper through a pipeline, and a lower sealing head of the material storage pot is connected with an inlet of the screwed feeder through a pipeline; an outlet of the screwed feeder is connected with the top of the material even mixing pot; the upper part of the material even mixing pot is cylindrical, while the lower part is of the inverted cone shape; the top end of material even mixing pot is connected with one end of a main air pipe, while the other end of the main air pipe is connected with an air compressor, and a material loosing air pipe is also led out from the main air pipe; and the bottom end of the material even mixing pot is connected with one end of a material conveying pipeline, while the other end of the material conveying pipeline is connected with a front smoke box of a boiler. The system can mix fine sand with air so as to enable the fine sand to be fluidized and has simple manufacturing process, strong controllability, high safety, good stability, ideal dust removing effect as well as convenient use and maintenance.