The invention discloses non-glue diatom ooze building material, which is used for wall decoration, surface dressing of boards and intermediate sandwich of the boards, and comprises the following components in parts by weight: 4-90 parts of kieselguhr below 10000 mesh, 20-60 parts of bentonite below 2000 mesh, 10-40 parts of kaolin below 2000 mesh, 5-30 parts of activated clay below 2000 mesh, 10-60 parts of quartz sand below 200 mesh, 5-40 parts of sepiolite below 800 mesh, 5-40 parts of calcium carbonate below 800 mesh, 5-30 parts of medical stone powder below 800 mesh, 2-20 parts of nanosized titania powder below 20000 mesh, 0.1-3 parts of fiber with the length being 5mm or below, 4.5-40 parts of attapulgite below 800 mesh, 2-20 parts of hydroxypropyl methyl cellulose, and 1-20 parts ofpigment. According to the non-glue diatom ooze building material, the kieselguhr and other porous natural materials with adsorption capacity are selected to manufacture interior building materials, the proportion is reasonable, chemical adhesive agents are not needed, and adhesive forming is realized through characteristics of the natural materials, so that porous structures of the natural materials can be maintained, indoor pollution can be eliminated, indoor humidity can be adjusted, odor can be removed, noise can be isolated, and flame retardant is realized.