The invention discloses a multifunctional combined dry hot rock energy storage heating system, which comprises a primary filtering reservoir, wherein the primary filtering reservoir is communicated with a secondary filtering reservoir; the secondary filtering reservoir is communicated with a recharge well straight well section through a transmission pipeline; the bottom end of the recharge well straight well section is communicated with the water inlet end of a dry hot rock water storage system through a recharge well inclined well section; the water outlet end of the dry hot rock water storage system is communicated with the bottom end of a geothermal water exploitation well straight well section through a geothermal water exploitation well horizontal well section; a submersible pump is arranged in the geothermal water exploitation well straight well section. According to the system, the exploitation efficiency of the dry hot rock can be improved by controlling the water injection time, the water injection amount and the water injection temperature, the temperature breakthrough time of the geothermal well is delayed, the problems of waste wind and waste light resources caused by wind power and photoelectric are comprehensively solved, and the wind power and photoelectric in a small area are used for heating geothermal tail water and ground surface replenishment cold water, sothat the sustainable development of the geothermal resources of the dry hot rock is ensured.