Perhydropolysilazane (PHPS), a ceramic precursor resin with outstanding high-temperature resistance, was used as the shell material to prepare novel sodium nitrate microcapsules (MCP-NaNO3) for high-temperature thermal energy storage. The microstructure and thermal properties of the MCP-NaNO3 were investigated by DSC-TG, SEM, FIR, EDS, etc. The MCP-NaNO3 presented a melting point of 306.19 +/- 0.10 degrees C and latent heat of 159.2 +/- 2.4 J/g. The MCP-NaNO3 had a thin shell, and the weight percentage of NaNO3 in the MCP-NaNO3 was calculated to be about 85 wt%. The melting point of MCP-NaNO3 almost had no change, and the supercooling of MCP-NaNO3 only had a small increase of about 2.69 degrees C compared with that of NaNO3. The thermal decomposition temperature of NaNO3 in the MCP-NaNO3 was enhanced more than 36 degrees C, up to 647.60 degrees C. The PHPS shell was able to ensure the MCP-NaNO3 to be still granular after heated at 350 degrees C, and the melting point and freezing point of the MCP-NaNO3 were almost invariable. The MCP-NaNO3 developed in this study has great promise in future energy and chemical processes. The method that using ceramic precursor resins as microcapsule shells paves a new way to prepare various high-temperature phase change micro capsules.