Double-working-condition constant-power rock soil thermal response site test device and three-level control method

The invention relates to the technical field of development and utilization of shallow geothermal energy, in particular to a double-working-condition constant-power rock soil thermal response site test device and a three-level control method. The device comprises a test device body and a control system for controlling the test device body, wherein the test device body mainly comprises a refrigerating machine, a heater, a flowmeter, a buried pipe and a water pump which are connected sequentially through pipelines. By means of three-level control measures of the test device, fluctuation output can be more stably reduced, the power consumption of the test device during working can be reduced, the environment temperature change influence is reduced to the minimum with the adoption of good thermal insulation measures, part of system errors during heat absorption and discharge of the test device are eliminated by means of water flow direction conversion switches, the test device is suitable for parameter research u