The invention relates to a deep well heat pump device and a use method thereof. The device is simple in structure, an underground water source cannot be polluted, energy consumption is little, the device is energy-saving and environment-friendly, and the maintaining cost is low. The device comprises a metal dual heat pipe mechanism, the metal dual heat pipe mechanism extends into a deep well, a deep well wall is arranged between the metal dual heat pipe mechanism and the deep well, the metal dual heat pipe mechanism is filled with heat-heat conduction medium, the top end of the metal dual heatpipe mechanism communicates with a heat conduction medium guide pipe, the metal dual heat pipe mechanism comprises an input heat pipe and an output heat pipe, and when the device is used in the family, the method comprises the following steps that firstly, heat and cold exchange energy is determined; secondly, according to the heat and cold exchange energy, the depth, arranged under the well, ofthe deep well heat pump device, the width of a well opening and the number of wells can be selected, during arranging, and 30-50% of allowance is reserved; thirdly, a connection path is determined; fourthly, mounting is carried out; fifthly, experiment operation is carried out; and sixthly, application and maintaining are carried out.