The invention relates to a solar energy wall body heat utilization system. A heat storage wall body, which consists of light transmitting glass, a metal framework, a light-gathering glass mirror, a metal fin heat-absorbing tube, a sealing part, a heat insulation wall body, and a heat preservation material, is matched with a thermal heater, a water heater, and a hot air exchanger, wherein a phase change medium in the heat-absorbing tube absorbs heat and outputs hot air by gathering light and storing heat from the sun; and exchanged fluid is refluxed, so heat is exchanged. The temperature of the surface can be up to 120 DEG C in winter, and the heat energy can be stored in an indoor water heater, and also can be synchronously used for domestic heat supply, such as heating, hot air exchange, hot water and the like. The solar energy wall body heat utilization system can be produced in standardization, universalization and industrialization, is widely used in construction and reconstruction of the wall body and a domestic heat supply source, and has an obvious energy saving effect.