▎ 摘　　要

NOVELTY - Preparing mica based electrothermal film involves arranging an upper heat conducting filling layer on an upper surface of an electric heating layer (3). An upper mica plate (1) is arranged on an upper surface of the upper heat conducting filling layer. A lower heat conducting filling layer is arranged on a lower surface of the electric heating layer. A lower mica plate (5) is arranged on a lower surface of the lower heat-conducting filling layer. An inner portion of the electric heating layer is provided with a mica substrate. USE - Method for preparing mica based electrothermal film. ADVANTAGE - The film is convenient to adjust thickness of the plating layer so as to change power of heating in working process, and reduces use amount of the electric heating layer in the mica high temperature resistant electrothermal film so as to save consumption amount of graphene raw material needed in process of preparing electric heating layer, thus ensuring high heating efficiency, and reducing manufacturing cost and saving economic consumption. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a mica based electrothermal film, which comprises electric heating layer comprising an electrified electrode, a current carrier and a graphene coating, graphene plating layer arranged on the surface of the mica substrate, where the energized electrode is arranged on both ends of the graphene plating layer through the current-carrying bar, the current-carrying bar and the energized electrode are welded and connected, and the materials of the current-carrying bar and the energized electrode are all conductive metals. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of a mica based electrothermal film. Upper mica plate (1) Upper thermally conductive filling layer (2) Electric heating layer (3) Lower thermally conductive filling layer (4) Lower mica plate (5)