The embodiment of the invention relates to the technical field of materials, in particular to an overweight release force non-silicon release film and a preparation method thereof. The embodiment of the invention discloses the overweight release force non-silicon release film and the preparation method thereof. The overweight release force non-silicon release film comprises a thin film base material layer and an overweight release force non-silicon release layer, wherein the overweight release force non-silicon release layer is prepared from the following components in parts by mass: 500 to 600 parts of butanone, 150 to 200 parts of ethyl acetate, 150 to 200 parts of cyclohexanone, 5 to 10 parts of polyvinyl alcohol and 5 to 10 parts of carbamic acid ester. Due to the mode, after a hot melt adhesive is thermally pressed on the release surface, the release film can keep constant release force, so that the problem that the release film is very likely to fall off due to extremely low release force caused by die cutting machining and multiple times of hot pressing machining of a small-size hot melt adhesive is solved.