The invention discloses nanometer heat insulation paint and a preparation method thereof. The nanometer heat insulation paint is mainly prepared from the following raw materials in parts by weight: 30to 40 parts of silicone acrylic emulsion, 6 to 10 parts of ceramic microbeads, 5 to 10 parts of silica gel, 14 to 20 parts of titanium dioxide, 1.5 to 2 parts of carbon nanometer tubes, 2 to 6 partsof nanometer tin dioxide, 3 to 5 parts of nanometer zirconium oxide, 8 to 12 parts of quartz powder, 0.4 to 0.8 part of cellulose thickening agents, 0.4 to 0.7 part of dispersing agents, 0.2 to 0.6 part of anti-foaming agents, 0.3 to 0.5 part of leveling agents, 1.3 to 1.7 parts of coalescing agents and 22 to 26 parts of deionized water. The nanometer heat insulation paint can effectively solve the problem of low bonding strength of the paint on a wall body, and has the advantages of good heat insulation effect, short curing time, strong adhesive force, long service life and the like.