Energy storage building material and preparation method thereof

The invention discloses an energy storage material obtained by compounding a mixture composed of capric acid and lauric acid and a building matrix material, wherein the mass ratio of the capric acid to the lauric acid is (1-8):1. The preparation method of the energy storage building material comprises the steps of respectively heating the capric acid and the lauric acid; mixing the acids according to the ratio range after the acids are completely dissolved to form an eutectic mixture of the capric acid and the lauric acid; heating the eutectic mixture to a completely molten state; and compounding the eutectic mixture into the building matrix material so as to form an energy storage building material which can enhance the temperature adjusting capacity of a building.