Flexible phase change composites have attracted extensive attention of researchers in the development of intelligent materials because of their excellent phase change energy storage properties, flexibility to withstand external force deformation and processability of composites with temperature control devices. In this paper, the research status of flexible phase change composites prepared by three kinds of support structure strategies, including polymer network blending, porous skeleton adsorption and phase change molecular structure design, were described in detail. The battery electronic devices, wearable electronic devices and flexible sensors were summarized. Finally, the research focus and future development direction of flexible phase change composites were prospected.