The invention discloses a composite architectural heat-insulation
coating and a preparation method thereof. The composite architectural heat-insulation
coating is formed by mixing the following ingredients by
mass: 25 to 40 parts of water, 0.3 to 0.9 part of a
thickening agent, 0.1 to 0.3 part of a multifunctional additive, 0.3 to 1.2 parts of an
ageing resistant additive, 0.2 to 0.5 part of a
wetting agent, 0.5 to 2.0 parts of a dispersing agent, 0.4 to 1.3 parts of a mold inhibitor, 0.2 to 0.5 part of an antifoaming agent, 2 to 5 parts of a film-forming additive, 8 to 20 parts of a
pigment, 6 to 13 parts of a heat-insulation functional additive formed by mixing two or three of
phase change microcapsules, hollow glass microspheres and
polymeric microspheres, and 38 to 52 parts of an
emulsion. The composite architectural heat-insulation
coating is favorable in appearance, excellent in storage stability, equal to or lower than 1.06 g / cm<3> in density, equal to or lower than 0.065 W / (m.k) in heat
conductivity, larger than 10 DEG C in heat-insulation
temperature difference, favorable in washability and brushability, and excellent in heat-insulation effect.