The invention discloses a modularization phase change energy storage decorative wall system. The modularization phase change energy storage decorative wall system is formed by assembling a plurality of modularization phase change energy storage decorative wall plates, a phase change energy storage material is placed in each modularization phase change energy storage decorative wall plate, and air passages and water flow passages are formed in each modularization phase change energy storage decorative wall plate, wherein the air passages and the water flow passages penetrate through the phase change energy storage materials; after the multiple modularization phase change energy storage decorative wall plates are assembled, a header water inlet pipe and a header water return pipe are connected to the two ends of the water flow passages; and the phase change materials are directly placed in the modularization wall plates, meanwhile, the air passages and the water flow passages are formed in the phase change energy storage material, the indoor temperature is adjusted through indoor air and water convective heat exchange and phase change material and indoor radiation heat exchange, the utilization rate of heat storage and heat release characteristics of the phase change material can be greatly improved, and thus the adjusting capacity of a wall body over the indoor temperature is improved. According to the mode of modularized production and on-site assembly of the wall plates, manpower and material resources can be saved, existing buildings can be directly and conveniently subjected to energy-saving transformation, and the application range of the phase change energy storage system in the buildings is increased.