Abstract: Polymer-based dielectrics are widely used in metalized film capacitors because of their high breakdown strength, excellent processability, and low cost. Nowadays the most commonly used energy storage dielectric material is biaxially oriented polypropylene(BOPP), which has defects such as low discharged energy density and large dielectric losses at high temperatures. Therefore, improving the performance of energy storage density and high-temperature resistance of polymer-based dielectric materials is an important issue in the field of dielectric energy storage. This paper reviews the application progress of new polymer-based dielectric materials in the field of high-temperature dielectric energy storage in recent years. Firstly, the charging and discharging principle of dielectric materials and the key parameters that determine the energy storage density of dielectric materials are introduced. Then, the latest research progress of high-temperature resistance dielectrics is reviewed from three aspects: dielectrics with high glass transition temperature, crosslinking dielectrics, and dielectrics with charge traps. Finally, the prospects in development direction of polymer-based high-temperature resistance dielectrics are concluded.