The invention provides anti-bacterial and mould-proof anion diatom ooze dry powder, which relates to the field of building and ornament materials. Diatom ooze is a novel environmental-protection decorative material and has the functions on adsorbing formaldehyde and adjusting humidity, but on the current market, most of diatom ooze dry powder is unreasonable in formula, and does not have anti-microbial, mould proof and anion releasing functions, and aiming at the defects of the prior art, the invention relates to the anti-bacterial and mould-proof anion diatom ooze dry powder, which is characterized by being prepared from the following raw materials in parts by mass: 30 to 45 parts of kieselguhr, 15 to 30 parts of bentonite, 15 to 30 parts of ash calcium powder, 15 to 30 parts of heavy calcium carbonate powder, 2 to 8 parts of titanium dioxide, 5 to 10 parts of quartz powder, 8 to 15 parts of anion powder, 6 to 15 parts of redispersible powder, 4 to 10 part of xanthan rubber powder, 3to 6 parts of white cement, 2 to 6 parts of polypropylene staple fiber, 0.5 to 1.5 parts of quaternary ammonium salt, 0.3 to 1 part of sodium bicarbonate, 0.2 to 1.2 parts of sorbic acid, 0.2 to 1.2 parts of copper sulfate, 0.1 to 1 part of sodium fluoride, 0.5 to 2 parts of OBPA, 0.8 to 2.5 parts of diethanol amine, 0.05 to 0.7 part of dispersing agent, and 0.03 to 0.5 part of lubricating agent.