The invention belongs to the technical field of
polyester thin films and in particular relates to a high-
transmittance polyester thin film and a preparation method thereof. The high-
transmittance polyester thin film comprises a core layer and a
surface layer arranged at one side or two sides of the core layer, wherein the
surface layer is prepared from the following components in percentage by
mass: 93 to 97 percent of
polyethylene terephthalate, 0.08 to 0.25 percent of
inorganic particles and 2.75 to 6.92 percent of other auxiliary agents, wherein the
inorganic particles are subjected to
coating and modification treatment through a compatilizer. According to the high-
transmittance polyester thin film provided by the invention, the
inorganic particles subjected to the
coating and modification treatment through the compatilizer are added into the
surface layer, so that the binding capability of the inorganic particles and
polyethylene terephthalate in the surface layer of the polyesterthin film is improved; a gap formed at the periphery of the
inorganic particle in the biaxially-stretched and molded polyester thin film is reduced, so that the problem that the inorganic particles exist so that the
light penetration rate is low is remarkably reduced; the
binding force between the inorganic particles subjected to the
coating and modification treatment through the compatilizer andpolyethylene terephthalate is relatively strong, and a series of appearance problems caused by the fact that the inorganic particles fall off are prevented.