The invention relates to the technical field of aerated brick manufacturing, in particular to an aerated brick coal ash residue removal device. The aerated brick coal ash residue removal device comprises a machine frame, a material screening barrel and a motor. Through holes are formed in the barrel wall of the material screening barrel. A transmission shaft is arranged in the middle of the material screening barrel and is connected with the inner wall of the material screening barrel through a connection rod. Bearings are arranged at the two ends of the transmission shaft and fixed to the machine frame through bearing pedestals. One end of the transmission shaft is connected with a driven wheel through a key. The driven wheel is driven by the motor to rotate. One end of the material screening barrel is higher than the other end of the material screening barrel. The higher end of the material screening barrel serves as a feed port, and the lower end of the material screening barrel serves as a discharge port. The aerated brick coal ash residue removal device is simple in structure; when the aerated brick coal ash residue removal device is used, mixtures of coal ash and water enter the feed port, the material screening barrel rotates so that fine coal ash and water can flow into a water mixing tank below the material screening barrel from the lower portion of the material screening barrel, and large-particle coal ash can be left in the material screening barrel and can flow out of the material screening barrel while the material screening barrel rotates.