The invention relates to a solar heat storage method. A heat accumulator consists of a metal framework, light transmitting glass with a light-gathering magnifier, a solar photovoltaic panel, a metal fin jacketed pipe, fixing devices, a heat leading-out tube, control valves, a return line, light-gathering reflective panels, an absorber plate, a heat insulation panel, a metal plate, a pipeline locking obturator, a storage battery and a controller, wherein the metal fin jacketed pipe is arranged in the center of hollow interlayers. The heat accumulator not only can be assembled into a wall but also can be independently placed for heat supply and photovoltaic power supply, can be widely used in building walls and used for heating and illumination, is widely suitable for households, guesthouses, hotels and work places, and can be produced in serialization and standardization.