The present invention provides a pre-coating film and a preparation method for the pre-coating film. The pre-coating film comprises: a substrate layer, wherein the substrate layer comprises a bottom material layer and a flexible coat, wherein the bottom material layer is a biaxial tension polyester layer, a biaxial tension nylon layer or a biaxial tension polypropylene layer, and the flexible coat is arranged on the first surface of the bottom material layer, and is formed from a mixture comprising a polyurethane dispersion and a curing agent; a middle layer, wherein the middle layer is arranged on the second surface of the bottom material layer, and is formed from a polyethylenimine aqueous solution; a hot melt adhesive layer, wherein the hot melt adhesive layer is arranged on the middle layer, and is formed from EVA, EEA, EAA or EMA; and a viscosity increasing layer, wherein the viscosity increasing layer is arranged on the hot melt adhesive layer, and is formed from a mixture comprising a modified acrylic acid emulsion or a modified polyurethane emulsion and an assistant agent. According to the present invention, with arrangement of the flexible coat, the surface of the pre-coating film has a soft touch feeling; with the viscosity increasing layer, the adhesion between the pre-coating film and the printed product can be enhanced, the requirements of the subsequent processing steps are met, and the use range of the pre-coating film is expanded.