The invention discloses heat-reflecting thermal insulation diatom ooze which is prepared from the following raw materials in parts by weight: 42-48 parts of re-dispersible rubber powder, 22-32 parts of hollow glass microspheres, 6-12 parts of pigment, 15-25 parts of titanium dioxide, 20-30 parts of calcium carbonate, 15-25 parts of aluminum silicate, 22-28 parts of kieselguhr, 10-20 parts of thermal insulation synergist and 0.5-5 parts of anti-freezing agent. The heat-reflecting thermal insulation diatom ooze disclosed by the invention can effectively prevent the accumulation of solar heat and consequent heating on the object surface and can automatically realize radiant heat dissipation and cooling of heat and has the advantages of good antibacterial property and wear resistance, convenience in construction and high efficiency.