High-efficiency and low-cost geothermal utilization system

The invention discloses a high-efficiency and low-cost geothermal utilization system. The high-efficiency and low-cost geothermal utilization system is mainly characterized in that the heat conduction property is used. The high-efficiency and low-cost geothermal utilization system comprises a ground heating station and an underground heat conduction column with a high heat conduction coefficient. The underground heat conduction column comprises an upper heat conduction column body, a middle heat conduction column body and a lower heat conduction column body which are connected into a whole in an end-to-end mode. The upper heat conduction column body is located in a surface cenozoic loose sedimentary stratum, the middle heat conduction column body is located in a middle stratum, and the lower heat conduction column body is located in a dry and hot rock stratum. According to the system, the underground heat conduction column is adopted and inserted into a geothermal layer, heat is conducted to the ground from the geothermal layer in a heat conduction mode, and the system can be efficiently used for a long time, consumes no energy and has excellent heat conduction efficiency. In addition, a traditional water injection circulation heat convection mode is not used, pollution to underground water and surface water is avoided, and the system has an excellent environment-friendly effect.