The invention relates to the technical field of geothermal systems, in particular to a gradient utilization enhanced geothermal system which can conduct gradient comprehensive utilization on geothermal energy, improves the geothermal utilization rate and saves energy. The gradient utilization enhanced geothermal system comprises a geothermal collecting device, a first-grade heat exchange device, afirst-grade utilization device, a second-grade heat exchange device, a second-grade utilization device, a third-grade heat exchange device, a third-grade utilization device, a capillary network system, a temperature control device, a water collecting tank and a geothermal recharging device. The gradient utilization enhanced geothermal system utilizes the geothermal energy as the heat source, andthe geothermal energy is clean and reproducible; gradient comprehensive utilization of the geothermal energy can be achieved, the geothermal utilization rate is improved, and energy is saved; screw pumps are arranged in the heat exchange devices, so that the heat exchange efficiency is improved; fixed trays and movable trays in bins can fix vegetables and fruits, under the driven of rotating rods,the drying process is accelerated; and the layered capillary network system is arranged in the bins, and uniform heating and drying of crops are facilitated.