The invention discloses a healthy and environment-friendly coating for indoor walls. The proportioning ratio of each raw material component of the coating is: nano-titanium dioxide, 3-12 parts, vinyl acetate emulsion, 15-25 parts, acrylic emulsion, 10-20 parts Bamboo fiber powder, 8-15 parts, shell powder, 8-15 parts, zinc oxide, 3-10 parts, carboxymethyl cellulose, 0.1-0.9 parts, chitin, 2-10 parts, sodium carboxylate, 0.1-0.8 parts, polydimethylsiloxane, 0.3-1.0 parts of water, the ratio of the water to the total amount of the base material is 1:1.2-1:1.5. The photolysis of nano-titanium dioxide can completely decompose harmful organic substances such as indoor formaldehyde and toluene, pollutants, bacteria and other harmful organic substances, and the obtained environmentally friendly coating has good moisture absorption, breathability, anti-mildew and antibacterial effects.