The invention discloses a wall material belonging to the field of building decoration, and specifically relates to antimicrobial radiation-preventing formaldehyde-degrading ecological diatom wall material paint and a preparation process and construction process of the wall material. The wall material is prepared from the following components in percentage by weight: 21-29% of kieselguhr, 15-20% of quartz sand, 0.1% of fiber, 7-8.6% of bentonite, 3-5% of attapulgite, 12-17% of sierozem, 6-8% of water-retaining agent, 8-12% of nano titanium dioxide, 3-6.1% of nano zinc oxide, 3-5% of zeolite, 3-5% of micro silicon powder, 3-5% of grammite and 3-7% of anion powder. The wall material disclosed by the invention has the effects of adsorbing toxic and harmful gas, resisting bacteria, preventing radiation and degrading formaldehyde, and diatom ooze enables the product to have the powerful characteristics of breathing, conditioning and purifying air; and the wall material has the functions of fire resistance, flame retardance, sound insulation, noise reduction, warm keeping and heat insulation. Thus, the wall material is an ideal wall decoration material combining an environmental protection function and artistic modeling.