NOVELTY - Manufacturing white film comprises: solid-phase polymerizing a polyester resin to prepare the polyester resin; preparing masterbatch, and then solid-phase polymerizing the masterbatch to prepare the masterbatch; mixing the polyester resin in the solid-phase polymerizing of the polyester resin with the masterbatch in the preparing and solid-phase polymerizing of the masterbatch, and then extruding it after melt-mixing to prepare a sheet; uniaxially drawing or biaxially drawing the prepared sheet; heat-treating the drawn film; and heat-setting the heat-treated film.    USE - The method is useful for making white film (claimed), which is useful for a billboard, a banner, a label, a package for food, a package for beverage, and the line, a industrial laminate, insulation, a backsheet for solar cell.    ADVANTAGE - The white film has excellent gloss, whiteness and opacity, and low content of oligomer extraction.    DETAILED DESCRIPTION - Manufacturing white film comprises: solid-phase polymerizing a polyester resin to prepare the polyester resin having the intrinsic viscosity of 0.65-0.90 and the oligomer content of less than 0.5%; preparing masterbatch including 5-25 parts by weight of amorphous polyester resin and 50-150 parts by weight of barium sulfate, based on 100 parts by weight of polyester resin, and then solid-phase polymerizing the masterbatch to prepare the masterbatch having less than of 0.5% of oligomer content within polyester resin, 500-3000 Poise of melt viscosity in the full range of Shear rate of 100-5000 l/s after melting at 280 degrees C for 5 minutes; mixing the polyester resin in the solid-phase polymerizing of the polyester resin with the masterbatch in the preparing and solid-phase polymerizing of the masterbatch, and then extruding it after melt-mixing to prepare a sheet; uniaxially drawing or biaxially drawing the prepared sheet; heat-treating the drawn film; and heat-setting the heat-treated film, where the white film has less than of 0.8% of oligomer content in the final film, and crystallization speed of 20-180 seconds being measured under the isothermal condition of 210 degrees C after melting at 280 degrees C for 5 minutes by using differential scanning calorimetry. An INDEPENDENT CLAIM is included for the white film prepared by the method.