The invention relates to a preparation method for a colored-stone foamed thermal-insulation decorative plate. The preparation method comprises the following steps: step 1, preparation of a green body: mixing raw materials consisting of perlite, bentonite, zeolite, kaolin, travertine, black clay, green ceramic silicon powder, fluorite tailings, combustible carbon powder, gangue, short-cut basalt fiber and polypropylene short-cut fiber, then successively carrying out crushing, wet ball milling, uniform ageing, spray drying, granulation and pulverization, carrying out compacting and molding so as to obtain a biscuit and drying the biscuit so as to obtain the green body; step 2, preparation of a glaze and glazing: subjecting the raw materials for the green body, albite and potash feldspar to ball milling so as to obtain the glaze and glazing the green body with the glaze; and step 3, carrying out high-temperature sintering on the glazed green body so as to form the colored-stone foamed thermal-insulation decorative plate with the glaze and with closed pores uniformly and densely distributed in the green body. The colored-stone foamed thermal-insulation decorative plate provided by the invention has the technical effects of lightweight, thermal insulation performance, fire resistance, water resistance, high strength, aging resistance and wearing of a decorative surface.