High-temperature-resisting easy collapse molding sand is made from, by weight, 240-280 parts of quartz sand, 50-55 parts of lightweight calcium carbonate powder, 20-30 parts of hollow ceramic microspheres, 10-15 parts of hollow glass microspheres, 40-55 parts of aluminum silicate powder, 25-30 parts of titanium dioxide, 35-40 parts of fluorite nano-powder, 30-40 parts of gypsum whisker, 60-70 parts of expanded perlite, 10-15 parts of talcum powder, 2-4 parts of sodium metasilicate, 1-2 parts of glucose powder, 1-2 parts of urea, 1-2 parts of chlorinated paraffin, and a proper amount of water. The materials such as the hollow ceramic microspheres and the hollow glass microspheres are used, so that the molding sand is fine in breathability and fluidity; meanwhile, the lightweight calcium carbonate, the glucose, the urea and the like are used, so that the molding sand is fine in high temperature collapsibility, high dry strength of sand molds, high in wet bonding power, excellent in sticking resistance and applicable to various hardening manners; drying time after CO2 hardening is shortened, and reuse rate of used sand can be increased significantly.