▎ 摘　　要

NOVELTY - Preparing phase change microcapsule composite material, comprises (1) performing ultrasonic emulsification on phase change material mixture by ultrasonic cell breaker to obtain phase change material emulsion, where the phase change material mixture contains anionic active agent and liquid-solid phase change material of liquid phase and the phase change material emulsion is an emulsion without stratification within 6 months at room temperature, (2) contacting cationic active agent with graphene dispersion liquid and carrying out ultrasonic treatment to obtain graphene modified dispersion liquid, and (3) dropwise adding the phase change material emulsion into the graphene-modified dispersion liquid to obtain mixed material, performing solid-liquid separation of the mixed material, washing and drying to obtain final product. USE - The phase change microcapsule composite material is useful for thermal energy storage devices (claimed). ADVANTAGE - The phase change microcapsule composite material: has excellent heat storage capacity and high thermal conductivity. The method is simple and efficient.