Air self-cleaning inorganic coating with antibacterial property under visible light

The invention discloses an air self-cleaning inorganic coating with antibacterial property under visible light and a preparation method thereof, high modulus water glass and silica sol are used as inorganic film forming matters, styrene-acrylic emulsion, titanium dioxide, ground calcium carbonate and various auxiliaries are added to obtain an inorganic interior wall coating, a nitrogen modified nano TiO2 antibacterial agent is doped, and the air self-cleaning inorganic coating with antibacterial property under visible light is prepared. More pores in the surface of the inorganic coating are utilized to contact air and water, release reactive oxygen free radicals and inhibit growth and reproduction of microorganisms on the surface of the coating, active substances can be generated under visible light, namely sunlight, so that the coating has antibacterial performance, in addition, the active substances can degrade organic pollutants in the environment into CO2 and H2O, air purification is achieved, and the coa