The invention discloses a silver/silicon dioxide double layer wall material-based multifunctional microcapsule phase-change material, and a preparation method thereof, and belongs to the field of microcapsule phase-change material. According to the preparation method, an organic phase change material, a silicon source, a modification agent with mercapto functional groups, an emulsifier, and a solvent are mixed and stirred so as to obtain an emulsion, and an initiator is added dropwise so as to obtain silicon dioxide signal-layer wall material microcapsules with mercapto groups; the silicon dioxide signal-layer wall material microcapsules, a silver source, a protective agent, and a reducing agent are mixed, and silver ion self assembling and reduction reaction are realized on the microcapsule surfaces under nitrogen protection so as to obtain the nano silver/silicon dioxide double layer wall material-based multifunctional microcapsule phase-change material. Particle size of the nano silver/silicon dioxide double layer wall material-based multifunctional microcapsule phase-change material ranges from 2 to 10<mu>m, possesses a double-layer structure composed of a metallic silver outer layer and an inorganic material silicon dioxide inner layer, is compact in structure, and high in thermal conductivity, possesses electrical conductivity, antibacterial properties, latent heat storage properties, and temperature regulation performance, and can be widely applied to the fields such as medicine, weaving, electron, and spaceflight.