The invention relates to the technical field of building materials, in particular to a manufacturing method for an autoclaved aerated concrete block. The manufacturing method comprises the following steps: S1, selecting mint, climbing groundsel herb, tea leaves and dry ginger, and grinding and smashing the materials to obtain an A product; S2, mixing sand, gypsum, ceramic waste residue and coal ash with water, and grinding the mixture into mixed slurry to obtain a B product; S3, mixing lime, cement, a foaming agent, a water-retaining agent, a foam stabilizer, fiber and the A product with the Bproduct, and stirring to form a C product; S4, mixing a formaldehyde purification adsorbent, tea leaves and fiber to obtain a D product; S5, pouring a first layer of the C product at the bottom of amold, then paving the D product on a first layer of the C product, then pouring a second layer of the C product on the D product to obtain a blank, and warming and precuring the blank; and S6, demolding the precured blank, and carrying out cutting, autoclaved curing and cooling to obtain the finished product. The obtained autoclaved aerated concrete block is relatively high in adsorption capacityfor toxic and hazardous substances such as formaldehyde, benzene and ammonia.