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Mannitol and inositol, as sugar alcohol phase change materials with high latent heat, have wide application prospects in medium temperature thermal energy storage. The phase change temperature of binary sugar alcohol can be adjusted by changing the proportion of the sugar alcohol components, thus the temperature range of application is wider than that of one-component sugar alcohol. There are some problems such as leakage, oxidation and supercooling during the thermal cycles of sugar alcohols. Micro/nanoencapsulation of sugar alcohols and addition of nucleating agent are effective measures to solve the problems. In this paper, silicon carbide doped mannitol and inositol binary sugar alcohol nanocapsules were prepared. Phase change characteristics and thermal stability of the nanocapsules were studied by differential scanning calorimeter, scanning electron microscope, thermogravimetric analyzer and thermal cycling test, and the influence of silicon carbide was discussed. The results show that the nanocapsules have high phase change enthalpy, high encapsulation rate and high energy storage efficiency. The thermal decomposition temperature is higher than that of the binary sugar alcohol. The supercooling degree of the nanocapsules decreases by 32.2 ℃ compared with the binary sugar alcohol after thermal cycling. [ABSTRACT FROM AUTHOR]