The invention discloses an energy-saving insulation material, characterized by comprising, by weight, 18-28 parts of calcium silicate, 5-10 parts of diatomite, 8-14 parts of quartz sand, 2-5 parts of polyvinyl butyral, 10-16 parts of pure acetate, 20-30 parts of porous expanded perlite, 3-5 parts of aluminum silica powder, 8-14 parts of magnesium sulfate, 6-13 parts of n-butyl methacrylate, 2-5 parts of acrylic emulsion, 4-10 parts of silicone-acrylic emulsion, 5-14 parts of stearic acid, 2-5 parts of aminopropyltriethoxysilane, 1-5 parts of acetone-formaldehyde polycondensate, 1-3 parts of acrylamido-methylpropane sulfonic acid copolymer, 3-8 parts of lauryl dimethyl amine oxide, 5-12 parts of modified lightweight calcium carbonate, and 8-20 parts of deionized water. The energy-saving insulation material has good thermal insulation, is fireproof, waterproof and corrosion resistant, is used for building exterior wall insulation, is capable of effectively protecting a main structure with the influence of 'heat bridge' substantially eliminated, helps stabilize indoor temperature to ensure that summer is not hot and winter is not cold, and can save energy and protect environment.