Internal wall paint with air purification function and preparation method thereof

The invention discloses an air-purification environment-friendly paint and a preparation method thereof. By using a water-based fluorocarbon resin emulsion as a film forming matter and an anatase sulfur/lanthanum-codoped nano titanium dioxide photocatalyst as an addition component of the paint, the air-purification internal wall paint with excellent self-cleaning property is prepared. The paint has the advantages of favorable scrub resistance, high adhesion, high paint film fullness, environment friendliness and excellent air purification photocatalytic performance, and has antimicrobial and moldproof functions. Under the irradiation of visible light, the catalytic degradation purification rate for formaldehyde and other gaseous pollutants caused by interior decoration can reach 80% above; and under the condition of no lighting, the sterilization rate for Staphylococcus aureus in the environment can reach 98% above.