Hydraulic fracturing test device capable of realizing multi-field coupling and use method

The invention discloses a hydraulic fracturing test device capable of realizing multi-field coupling and a use method, the hydraulic fracturing test device comprises a single-axis servo loading unit, a heating constant temperature unit, a high temperature constant temperature unit, a pressurizing unit, a hydraulic fracturing unit, a strain monitoring unit and a monitoring unit, and is characterized in that the heating constant temperature unit is divided into an upper part and a lower part; the upper part is a heating thermostat, and the lower part is a heating thermostat. The device has the advantages that the device is simple in structure, reasonable in arrangement and easy and convenient to operate, hydraulic fracturing under the coupling effect of a temperature field, a stress field and a seepage field can be achieved, the temperature field, the stress field and the seepage field can be considered synchronously, and the test result can provide technical theoretical support for deep rock mass geothermal ex