The invention relates to an environment-friendly coating composition for a building interior material. The environment-friendly coating composition comprises an adhesive, a filler, a plasticizer, water and other additives. The environment-friendly coating composition is characterized in that, polyester is used as the adhesive, modified starch is used as an organic filler, and an epoxy resin emulsion is used as the plasticizer. The environment-friendly coating composition is advantageous in that, biodegradable polyester is used as the adhesive, thereby improving biodegradation rate, the epoxy resin emulsion is used as the plasticizer, thereby preventing generation of volatile organic compound, and use of an organic solvent, since the hyrophobic modified starch is used as the organic filler, reducing the condition of tacky coated composition and improving drying speed, thereby improving operation efficiency, and the water is used as the solvent, and therefore a water-based paint composition is provided.