The invention discloses an energy-saving phase-change interior wall water-based paint and a preparation method thereof, and belongs to the technical field of coatings. The energy-saving phase-change interior wall water-based paint comprises the following raw material components: deionized water, cellulose A, cellulose B, a dispersant, a wetting agent, a potassium silicate stabilizer, an antifoaming agent A, titanium dioxide, wollastonite, mica powder, diatomite, an antifoaming agent B, a potassium silicate solution, a modified polymer emulsion, a coalescing agent, a thickening agent A, a thickening agent B, a thickening agent C and a microcapsule phase change material. The energy-saving phase-change interior wall water-based paint prepared by the invention has good functions of leveling, decorating, and sealing base materials and the like based on the phase-change material heat storage and release technology; the energy-saving phase-change interior wall water-based paint has stable andefficient heat storage and release functions, endothermic reaction is induced when the wall surface temperature is above 25 DEG C, and exothermic reaction is induced when the wall surface temperatureis lower than 15 DEG C, the overall temperature of buildings is automatically adjusted, energy consumption is reduced, the applicability is high, and the paint is easy to apply and popularize.