High-temperature-boiling-resistant polyester film and preparation method thereof

The invention relates to a high-temperature-boiling-resistant polyester film and a preparation method thereof, and relates to the field of polyester films, the high-temperature-boiling-resistant polyester film comprises a base layer, one side or two sides of the base layer is/are coated with a pre-coating film, and the pre-coating film is provided with an aluminum-plated layer; raw materials of the pre-coating film comprise a component A and a component B which are independent, wherein the component A comprises the following raw materials in parts by weight: 25-30 parts of water, 60-70 parts of a hydroxyl acrylic emulsion, 4-8 parts of a solvent, 0.1-1 part of an auxiliary agent and 1-10 parts of modified nano silicon dioxide; the component B is prepared from polyisocyanate; the mass ratio of the component A to the component B is (10-15): 1. The surface layer of the polyester film is coated with the pre-coating film through the online coating technology, the pre-coating film is a two-component waterborne poly