Abstract: Polymer film capacitor is one of the important power equipment supporting the development of new energy intelligent distribution network. Improving the energy storage density of polymer dielectric film is the key to improve the performance of film capacitor energy storage devices. According to the classical electromagnetic theory, improving the energy storage density of polymer dielectric film can be achieved from the dielectric constant and breakdown strength. However, most of the current reviews in the field of energy storage film are summarized and analyzed from the perspective of increasing the dielectric constant to increase the energy storage density, whereas, systematical review from the perspective of breakdown strength is relatively rarely available in the literature. Therefore, we attempt to take all-organic polymer dielectric as the research object and focus on the strategies of doping, blending, copolymerization and multilayer structure based on the perspective of improving the breakdown strength. Thereby, we also further collate and compare the effects of various strategies. We hope to provide some ideas for the subsequent structural design and improvement of breakdown performance of all-organic polymer composite film.