The invention provides high-performance microscopic microfiber building heat insulation and heat preservation slurry with high tensile strength, compressive strength, heat insulation performance and tear resistance, and a using method thereof. The slurry comprises the following components of crylic synthetic resin, fluorinated silicone synthetic resin, a water retention thickening agent solution,a sepiolite fiber, a vermiculite fiber, a mullite fiber, powdered silicon dioxide, pearlife, a rock wool fiber, hollow ceramic microballs, a defoaming agent, a mildewproof bacteriacide and water; andfurthermore, white portland cement, a reinforcing agent and water which is 20 to 30 weight percent of a component A can be added.