Abstract: Dodecyl alcohol (DA) was coated with melamine-formaldehyde (MF) and polyethylene glycol modified melamine-formaldehyde (PMF) resin to prepare microencapsulated phase change materials (MicroPCMs). They were respectively added into wood flour/high-density polyethylene (WF/HDPE) composites to obtain MicroPCMs-WF/HDPE composites with thermal energy storage capacity. The surface morphology and mechanical properties of MicroPCMs were characterized by SEM, FTIR and nanoindentor etc. The physical and mechanical and thermal properties of MicroPCMs-WF/HDPE composites were investigated. The results show that the elastic modulus and hardness of modified microcapsules (PMF-MicropCMs) increase by 13.9% and 30.0% compared to unmodified microcapsules (MF-MicroPCMs) after polyethylene glycol modification, respectively. The melting temperature range (22.2-28.7℃) of MicroPCMs-WF/HDPE composites fits the human comfortable temperature range, and the temperature change speed is lower than pure WF/HDPE composites. The incorporation of MicroPCMs has a negative effect on flexural and tensile properties of WF/HDPE composites but favor the moisture absorption performance, impact strength and surface hardness; All properties of PMF-MicroPCMs-WF/HDPE composites are better than those of MF-MicroPCMs-WF/HDPE composites. All the mechanical properties meet the requirements for wood plastic decorative boards.