Metal-based phase change materials (PCMs), represented by Al-Si alloys, are ideal high temperature PCMs due to their high latent heat, high thermal storage density, high thermal conductivity and low expansion rate. However, metal-based PCMs need to address the problem of high temperature corrosion and extend their application scenarios through encapsulation techniques. In this research, the preparation idea of microencapsulation of metallic PCMs followed by shape-stable encapsulation was proposed. By "solvent evaporation-heating curing" method, the microencapsulated phase change materials (MEPCMs) were synthesized, using SiCN cured by organic polysilazane as heat resistant shell and Al-Si as the core material with the core-shell mass ratio of 4:1. Followed by mixing, cold pressing and sintering, the skeleton precursor materials of glass powders and MEPCMs were prepared into shape-stable ceramic composite materials to achieve the secondary encapsulation of PCMs. The experimental results showed that the core PCMs, the shell material and the skeleton material have good chemical compatibility. The microencapsulated phase change materials (MEPCMs) could be embedded in the dense ceramic skeleton and could maintain good core-shell structure during the melting-freezing process, indicating that the double encapsulation processes could avoid the leakage of the internal PCMs and maintain the phase change properties. The composite material had good thermal stability and thermal storage properties, which could be a promising material for high temperature thermal storage field.