PTC heating film and preparation method thereof

The invention discloses a PTC (Positive Temperature Coefficient) heating film and a preparation method thereof. The heating film comprises a base film layer, a silver paste layer, a carbon paste layer, a first adhesive film layer, a metal shielding layer and a double-sided adhesive layer, the metal shielding layer is connected with the ground wire so as to shield possible electric leakage of the silver paste layer and the carbon paste layer, and the metal shielding layer can uniformly dissipate heat of the carbon paste layer; the base film layer, the silver paste layer, the carbon paste layer, the first adhesive film layer, the metal shielding layer and the double-sided adhesive layer are fixedly connected in sequence; according to the PTC heating film, the grounded metal shielding layer is added, electric leakage can be conducted to the ground through the ground wire under the condition that the PTC heating film leaks electricity, leakage current is effectively reduced, and misoperation of leakage protection