PTC effect electrothermal film and preparation method and application thereof

The invention discloses a PTC effect electrothermal film and a preparation method and application thereof. The PTC effect electrothermal film comprises a film substrate, an electrothermal layer with a PTC effect, a conductive circuit and a circulation relay, the electrothermal layer with the PTC effect comprises nano silicon hybrid resin, flake graphene, a heat-sensitive material, a conductive agent and an auxiliary agent, the electrothermal layer with the PTC effect covers one surface or two surfaces of the film substrate, and the conductive circuit is connected with the circulation relay. And the circulation relay is arranged in the conductive circuit. The preparation method of the PTC effect electrothermal film comprises the following steps: 1) preparing electrothermal slurry; and 2) coating the electrothermal slurry on the surface of a film substrate, drying to form a film, arranging a conductive circuit and a circulating relay, and arranging a temperature sensor as required to obtain the PTC effect elect