The present invention relates to a film for a tire inner liner, and specifically, to a film for a tire inner line comprising: a base film comprising a copolymer or mixture of a polyamide-based resin and a polyether-based resin; and an adhesive layer comprising resorcinol-formalin-latex (RFL)-based adhesive in which the tensile recovery of the base film is 30-80%, and a preparation method thereof. The film for a tire inner liner of the present invention can implement excellent sealing properties even when being thin, thereby enabling a tire to be lightweight and to improve gas mileage for automobiles and facilitating molding in a manufacturing process of a tire.