A method of making a heating film for a vehicular lampshade contains steps of: producing an adhesive layer in which a substrate made of transparent resin is provided, transparent adhesive is coated on the substrate to form a first adhesive portion, and the transparent adhesive is coated on the substrate opposite to the first surface to form a second adhesive portion; adhering a release paper on the first adhesive portion; and forming a conductive layer on the second adhesive portion. A cover lamination is printed on the conductive layer and is curved, such that a portion of the conductive layer not being covered by the cover lamination is removed in an etching manner so as to maintain the other portion of the conductive layer covered by the cover lamination and to form a curved current path. The conductive layer includes two electrical contacts electrically connected with two wires respectively.