The invention discloses environment-friendly interior wall putty. The environment-friendly interior wall putty comprises the following components in parts by weight: 100 parts of interior wall putty base powder, 5-12 parts of sticky rice glue, 5-12 parts of pregelatinized starch, 2-6 parts of bamboo carbon fibers or bamboo carbon powder, 8-10 parts of spices, 1-3 parts of nano ZnO, and 20-60 parts of water. The interior wall putty base powder comprises ground calcium carbonate, ash calcium and white cement; the length of the bamboo carbon fibers is 0.5-5 millimeters, and the diameter of the bamboo carbon fibers is 10-20 microns; the fineness of the bamboo carbon powder is 200-300 meshes; and the diameter of the nano ZnO is 10-20 nanometers. The invention further discloses a method for preparing the environment-friendly interior wall putty. The materials are matched cooperatively in proportion, so that the crack resistance, the hardening strength, the compactness, the mildew prevention, the bacteria resistance and the probiotics environment friendliness of the environment-friendly interior wall putty can be remarkably improved.