NOVELTY - A phase-change and energy storing capsule (C1) is prepared by taking organic phase-change material with 100-300 J/g in phase-change latent heat and using alginate, silicate, polyethylene, polypropylene or polyphenyl ethylene as basic material to prepare shaped phase-change material granule; adding prepared shaped phase-change material granule into organic polyamine monomer or low polymer; and taking shaped phase-change material granule after surface processing to add into carbonic ester monomer or low polymer, reacting, filtering, washing and drying product to obtain desired capsule (C1).    USE - Method for preparing of phase-change and energy storing capsule (C1) for solar energy heat storing system and energy conserving building preservation wall.    ADVANTAGE - The prepared capsule (C1) has non isocyanate polyurethane as capsule wall. The method uses environment protecting non isocyanate polyurethane as the capsule wall to replace poisonous isocyanate polyurethane, thus avoiding leakage of the phase-change material.    DETAILED DESCRIPTION - Phase-change and energy storing capsule (C1) is prepared by:    (A) taking organic phase-change material with 100-300 J/g in phase-change latent heat and using alginate, silicate, polyethylene, polypropylene or polyphenyl ethylene as basic material to prepare shaped phase-change material granule;    (B) adding prepared shaped phase-change material granule into organic polyamine monomer or low polymer for immersion for 10-120 minutes and taking out to dry, where organic polyamine comprises diethylenetriamine or tetraethylene pentamine; and    (C) taking shaped phase-change material granule (10 pts. wt.) after surface processing to add into carbonic ester monomer or low polymer solution (12-25 pts. wt.) which is diluted via ethyl acetate under stirring at 10-100 revolutions/minute (rpm), reacting at 30-70 degrees C for 1.5-6 hours so that surface of shaped phase-change material granule generates non isocyanate polyurethane layer, filtering, washing and drying product to obtain desired capsule (C1), where using amount of ethyl acetate in the carbonic ester monomer or low polymer solution accounts for 6-50 mass% of carbonic ester monomer or low polymer.    An INDEPENDENT CLAIM is included for the capsule (C1) prepared by above cited method. The capsule (C1) is a mononuclear shell structure, where capsule wall is made from non isocyanate polyurethane compactly clad on capsule core with shaped phase-change material. The capsule core with shaped phase-change material comprises organic phase-change material. The organic phase-change material accounts for 20-80 mass% in capsule (C1).