The invention provides a chromic slag aerated brick. The chromic slag aerated brick is prepared from the following raw materials: 20 to 30 weight parts of chromic slag, 25 to 30 weight parts of coal ash, 5 to 10 weight parts of cement, 4 to 6 weight parts of modified attapulgite, 5 to 10 weight parts of barium carbonate slag, 5 to 10 weight parts of ceramics factory waste, 5 to 10 weight parts of calcium carbonate powder, 10 to 15 weight parts of lime, 0.1 to 0.3 weight percent of triethanolamine lime, 4 to 5 weight parts of gypsum, 0.02 to 0.08 weight part of aluminum powder, oxyparaffin soap which is 3 to 5 percent based on the weight of the aluminum powder, 0.01 to 0.02 weight part of calcium bicarbonate, 2 to 3 weight parts of volcanic rock, 1 to 2 weight parts of lignocellulose, 0.3 to 0.5 weight part of sodium silicate, 0.03 to 0.05 weight part of borax, 1 to 2 weight parts of sodium hexametaphosphate, 1 to 2 weight parts of hydroxypropyl methyl cellulose sodium and 1 to 2 weight parts of superfine polyvinyl alcohol. Chromic slag is added into the raw materials of the aerated brick, other conventional aids and modified nano aids are added, and the aerated brick processed by an appropriate process is low in cost and high in performance, achieves the cyclic economy effect of changing waste into wealth, and reduces pollution; and the processed aerated brick has the characteristics of light volume weight, high thermal insulation performance, good sound insulation effect and high intensity and can be used for a non-load bearing wall body or a load bearing wall body.