The invention discloses decorative wall material diatom ooze. The decorative wall material diatom ooze is prepared from the following raw materials: 325-mesh kieselguhr, 325-mesh talcum powder, a plant coagulant, white cement 325#, hydroxyethylmethylcellulose (HEMC), negative ion powder, a nano-photocatalyst, lignocelluloses, strain cellulose, 200-mesh coarse whiting, a dry powder defoaming agent, a dry powder retarder, titanium dioxide, mica powder, inorganic bentonite, 80 to 120-mesh snowflake white, multifunctional powder, a water reducing agent, gluconic acid sodium salt, attapulgite and bamboo charcoal powder. The decorative wall material diatom ooze is low in cost, the elimination rate and dissolution rate to formaldehyde dissociated in indoor air reach up to not less than 96 percent, and European standards and national standards are completely met; the decorative wall material diatom ooze not only has the efficacies of preventing fire and retarding inflaming, removing odor, adjusting indoor humidity and disinfecting, reducing noise and sound, insulating and saving energy, improving sleep, cleaning trash and self-cleaning and the like, but also can enable the humidity of air to be kept between 40 to 60 DEG C, the heat-insulating property of the decorative wall material diatom ooze is 2 times or above that of a current diatom ooze coating, 3400 negative oxygen ions or above can be released every second from each square centimeter, far infrared rays also can be released, and the decorative wall material diatom ooze has a healthcare function on a human body.