The invention discloses a production process of autoclaved aerated concrete containing high-calcium dry red fly ash. The production process comprises the steps: pulping, powder grinding, casting, cutting and steam curing, wherein during pulping, the high-calcium dry red fly ash, quartz sand, gypsum and water are mixed uniformly at a ratio so as to prepare stand-by slurry, and after quicklime is ground into fine powder, pouring is performed; during pouring, the stand-by slurry, the powdery quicklime and cement are weighed at a ratio, then feeding is performed uniformly by a feeder, even stirring is performed so as obtain mixed slurry, and an aluminum powder solution is added at a ratio so as to form a liquid-phase mixture; and aluminum powder reacts with a medium water in an alkaline environment so as to generate hydrogen gas, the quicklime reacts with water, and silica in the quartz sand reacts with Ca(OH)2 and AL2O3 in the cement and quicklime under a hydrothermal synthesis conditionso as to produce hydrated calcium silicate and hydrated calcium aluminate and form a green body, and steam curing is performed after cutting is performed on the green body. The strength of the productis enhanced by the produced hydrated calcium silicate and hydrated calcium aluminate together, and the problem of difficult improvement of compression resistance, seismic resistance, tensile resistance and shear strength of walls in the prior art is solved.