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The superior thermal behavior and light-to-thermal energy conversion performance are crucial for microencapsulated phase change materials (microPCMs) in thermal energy management. In this work, a series of paraffin@graphene/melamine-formaldehyde microPCMs based on graphene Pickering stabilizer were prepared by in-situ polymerization. Graphene was served as a Pickering stabilizer. We have undertaken a comprehensive study of the effects of different graphene concentrations and core/shell ratio on the microPCMs. The leakage rate test showed that the leakage rate of the microPCMs with 0.2 wt% of graphene is decreased by 93.20% than that of the microPCMs without graphene. Graphene promotes light-to-thermal conversion efficiency of microPCMs, which reaches to 90.7%. Additionally, the optical microscope (OM) and scanning electron microscope (SEM) were used to characterize the …