The invention relates to a paint technology, an environment-friendly technology and an antibacterial mould-proof technology, in particular to high-efficiency environment-friendly antibacterial mould-proof inorganic composite nano paint and a preparation method thereof. The high-efficiency environment-friendly antibacterial mould-proof inorganic composite nano paint comprises the following components in percentage by weight: 0.5 to 5 percent of 
wetting dispersant, 0.01 to 20 percent of inorganic composite nano 
antibacterial agent concentrated pulp, 0.5 to 10 percent of hydrophobing agent, 0.5 to 10 percent of anionic 
powder, 0.5 to 8 percent of film-forming aid, 0.1 to 2 percent of anti-
settling agent, 0.8 to 10 percent of antifreezing agent, 0.1 to 3 percent of defoaming agent, 4 to 30 percent of 
pigment, 0 to 30 percent of filler, 15 to 45 percent of 
emulsion, 0.1 to 4 percent of 
thickening agent, 0.1 to 3 percent of flatting agent, 0 to 3 percent of pH 
regulator and 0.5 to 45 percent of water. The high-efficiency environment-friendly antibacterial mould-proof inorganic composite nano paint is mainly prepared by adding the inorganic composite nano 
antibacterial agent into the basic materials, so that the paint has the 
coating characteristic of high performance, is low is cost, and has a function of purifying air, can eliminate harmful gas volatile organic compounds (VOC), 
formaldehyde and the like and also has a durable and high-efficiency antibacterial mould-proof function, so that the sterilizing rate within 6 hours reaches 100 percent and the mould-proof grade reaches the first grade. By the high-efficiency environment-friendly antibacterial mould-proof inorganic composite nano paint and the preparation method thereof, self-cleaning performance, hydrophobicity, scrubbing resistance, 
dirt resistance and 
weather resistance of the 
coating are improved; and the high-efficiency and durable antibacterial and mould-proof effect is achieved.