Taking lauric acid-paraffin wax (LA-PW) volcanic rock (VR) shape-stabilized phase change materials with particle sizes of 1–3mm and 4–6mm as the research objects, analysis was made on the enthalpy, infrared spectrum, leakage characteristics, heat storage, heat release of shape-stabilized phase change materials. The results show that shape-stabilized phase change material has lower enthalpy with the increase in mass fraction of volcanic rock, but the material melting point and freezing point remain basically unchanged, and the shape-stabilized phase change material does not produce new substances, displaying stable composition. It can be seen from the leakage characteristics that, under the same ratio, shape-stabilized phase change material with a volcanic rock particle size of 1–3 mm has greater thermal stability than that with a volcanic rock particle size of 4–6 mm.