The invention relates to a thermal insulation coating for a barrier fabric and belongs to the technical field of preparation of coatings. The thermal insulation coating is characterized in that a flaky material is used as a substrate and is loaded with a deposited tantalum oxide material; the deposited tantalum oxide material uniformly coats a flaky substrate-shaped lens to form filler particles with high reflection strength; the filler particles have excellent reflecting properties for visible light and near-infrared light, so that the heat absorption property of textiles is effectively reduced, and a heat insulating protection effect is realized; and moreover, tantalum oxide formed by surface deposition and calcination compactly coats modified filler doped in the coating prepared by the invention and has excellent stable performance, so that the corrosion is effectively prevented in the daily use process of the coating, and the thermal insulation coating has high stability and using persistence.