The invention discloses a crushed stone-type alumina light ceramsite with an air purifying function. Ingredients of the ceramsite comprise attapulgite clay powder with an air purifying function, alumina, activated carclazyte residues, white carbon black, sodium aluminate, hollow beads, calcined gypsum powder, sodium dodecyl sulfate and a scrubable alumina photocatalyst spray liquid. Through ingredient stirring, extruded granulation, drying, crushing, screening, roasting, thermal insulation, screening, immersion, drying, screening and sealed packaging, the crushed stone-type alumina light ceramsites with an air purifying function are obtained. The crushed stone-type alumina light ceramsite with an air purifying function has a specific surface area, low bulk density, light weight, high strength, high moisture absorption and excellent adsorption and purification performances, is suitable for being used in a room, a furniture cabinet, a vehicle, a ship or other buildings, has effects of adsorption and degradation of pollutants such as formaldehyde, ammonia, benzene and TVOC and realizes the purpose of purifying the air for a long time.