The invention discloses a papermaking waste residue aerated brick which is characterized by being prepared by the following raw materials by weight: 17-19 parts of papermaking waste residues, 9-13 parts of lime, 15-18 parts of river sand, 14-17 parts of apatite, 6-11 parts of cement, 0.3-0.5 part of aluminium powder, 0.2-0.4 part of sodium dodecanol sulfate, 0.1-0.4 part of methyl polyoxyethylene ether, 0.2-0.5 part of methyl methacrylate, 2-4 parts of milling steel fibers, 7-9 parts of sintering dry-method desulfurized fly ash, 0.15-0.3 part of gellan gum, 0.3-0.6 part of mannan, 1-3 parts of oleic acid, 2-5 parts of manganese dioxide, 0.1-0.3 part of symplocos paniculata, 0.2-0.6 part of chilli seeds, 3-6 parts of auxiliary agents, and a proper amount of water. According to the invention, papermaking waste residues are added into raw materials of aerated bricks, and other routine auxiliary agents are also added; the aerated bricks processed by appropriate technology have the characteristics of low cost, low unit weight, few cracks, high thermal insulation performance, good sound-absorbing effect, and high compressive strength. The circular economy effect of changing waste into valuables is realized, and pollution is reduced.