Biaxially oriented polyester semi-gloss pre-coating film

The utility model discloses a biaxially oriented polyester semi-gloss pre-coating film. The biaxially oriented polyester semi-gloss pre-coating film comprises a base material, an intermediate layer and a hot melt adhesive layer, wherein the base material consists of a high-gloss biaxially oriented polyester thin film and a semi-gloss coating; the semi-gloss coating is formed by coating semi-gloss varnish on a first surface of the high-gloss biaxially oriented polyester thin film; the intermediate layer is formed by coating a polyethylenimine aqueous solution on a second surface of the high-gloss biaxially oriented polyester thin film; the hot melt adhesive layer is formed by compounding ethylene-vinyl acetate, low-density polyethylene, ethylene-ethyl acrylate or ethylene-methyl acrylate on the intermediate layer. The biaxially oriented polyester semi-gloss pre-coating film disclosed by the utility model has the characteristics of high color saturation degree, proper semi-gloss degree, high tensile strength, high stiffness and width and high flatness, and can be used for improving the exquisite degree of printing products; moreover, when the measurement angle is 60 degrees, the haze of a semi-gloss surface can reach 45-80%, and the transparency of the thin film can reach 80-95%.