The present application discloses a building sunscreen and heat-insulating
coating and a preparation method thereof, which relate to the technical field of building coatings, and include a building sunscreen and heat-insulating
coating A and a building sunscreen and heat-insulating
coating B. The building sunscreen and heat-insulating coating A and the building sunscreen and heat-insulating coating B are mixed and then applied, and the
mass ratio of the building sunscreen and heat-insulating coating A and the building sunscreen and heat-insulating coating B is 1-2:4, or the building sunscreen and heat-insulating coating B is applied first, and then the building sunscreen and heat-insulating coating A is applied after
drying, and the application thickness ratio of the building sunscreen and heat-insulating coating B and the building sunscreen and heat-insulating coating A is 4:1; the present application has the following effects: the building sunscreen and heat-insulating coating B is applied first, and the modified silica
aerogel B contains more
boric acid microparticles, thereby enhancing the adhesion to the substrate and the durability of the coating, and then the building sunscreen and heat-insulating coating A is applied, and the modified silica
aerogel A contained therein contains less
boric acid microparticles, thereby providing more
sun protection and durability.