NOVELTY - An energy-saving environment-friendly phase change energy storage material is prepared by (A) preparing ternary compound phase change material, (B) performing banburying process, (C) extruding, and (D) crushing sheet irradiation crosslinking. The step (A) comprises putting decanoic acid, lauric into sealed mixer, mixing for 5-8 minutes at 50-55 degrees C, adding paraffin, continuously mixing for 2 hours at 50-55 degrees C for 3 minutes to prepare ternary compound phase change material, The ratio of paraffin, capric acid, and lauric acid is 10-30:45-35:45-35.    USE - Method for preparation of energy-saving environment-friendly phase change energy storage material used with polymer base composite material to prepare phase change automobile interior trim material, automobile cushion, heat-accumulating temperature adjusting floor, building converter wall interlayer, phase change heat insulating material, phase change wall paper, bedding and phase change layer.    ADVANTAGE - The storage material has micro capsule having better coating effect and low production cost.    DETAILED DESCRIPTION - Energy-saving environment-friendly phase change energy storage material is prepared by (A) preparing ternary compound phase change material, (B) performing banburying process, (C) extruding, and (D) crushing sheet irradiation crosslinking. The step (A) comprises putting decanoic acid, lauric into sealed mixer, mixing for 5-8 minutes at 50-55 degrees C, adding paraffin, continuously mixing for 2 hours at 50-55 degrees C for 3 minutes to prepare ternary compound phase change material, The ratio of paraffin, capric acid, and lauric acid is 10-30:45-35:45-35. The step (B) comprises putting ethylene-propylene drive monomer (EPDM) into internal mixer at 75-85 degrees C, and adding prepared composite phase change material, antiaging agent RD, sensitizer trimethylolpropane trimethacrylate and vein graphite, and banburying for 8-10 minutes. The wt. ratio of EPDM, composite phase change material, antiaging agent RD, sensitizer trimethylolpropane trimethacrylate and vein graphite is 10-20: 40-80:1.5-2:3-4:10-15. The step (C) comprises extruding at 70 plus minus 5 degrees C, 90 plus minus 5 degrees C, 100 plus minus 5 degrees C, 110 plus minus 5 degrees C, and 120 plus minus 5oC for first to fifth areas respectively. The step (D) comprises crushing sheet radiation crosslinking by electron accelerator to cross thermosetting polymer sheet, where irradiation dose is 20 Mrad; and subjecting ultra-low-temperature, crosslinked thermosetting polymer sheet by super low temperature crusher at - 70 degrees C; crushing to fineness of filling powder to less than 40 meshes and obtain desired storage material by adding calcium stearate and ethylene acid amide powder as insulating agent.