Polymer film capacitors are extensively utilized in new energy vehicles, pulsed power systems, and various other sectors owing to their exceptionally high power density and swift charge-discharge capabilities. Nevertheless, commonly employed materials, such as commercial biaxially oriented polypropylene (BOPP), are plagued by problems like a low dielectric constant (εᵣ is approximately 2.2) and a relatively weak breakdown strength (BDS is around 600 MV/m). Although aromatic polymers (such as polyimide and polycarbonate) boast favorable insulation properties, the pronounced π-π stacking effect results in a notable surge in conduction loss when subjected to high electric fields. This, in turn, restricts the enhancement of energy storage density. Hence, the development of polymer dielectric materials that can simultaneously achieve high energy storage density, high charge-discharge efficiency, and stability continues to pose a significant challenge in the current field of polymer capacitive energy storage.