The composite phase change material of graphene aerogel was successfully prepared in this paper by a one-pot method. The three-dimensional network structure not only serves as a support carrier to solve the leakage of phase change materials, but also provides thermal conduction channels for heat transfer of phase change materials. Compared with pure phase change materials, the enthalpy of composite phase change material of graphene aerogel slightly reduced, but the thermal conductivity and light-to-heat conversion efficiency increased much. After the material was kept at a constant temperature of 90 ℃ for 60 min, no liquid leakage occurred. The results provide new ideas and theoretical basis for the experiments of composite phase change materials with high thermal conductivity, leakage resistance and high light-to-heat conversion efficiency.