The invention discloses a vehicle-mounted physical parameter tester of geological heat of a ground source heat pump. The physical parameter tester comprises a heat-insulating water tank, an electrical heating tube, a circulating pump for a buried tube, a circulating pump for an evaporator, an air-cooled heat pump unit consisting of the evaporator, a compressor, a condenser, an expansion valve and a fan, and a controller. In the vehicle-mounted physical parameter tester of the geological heat of the ground source heat pump, the cold and heat source is provided by the air-cooled heat pump unit, so the whole tester has a compact structure, can be placed on a vehicle, and is very flexible and convenient to use. In addition, the cold and heat source mainly comes from air, so that other cooling and heating facilities are not needed. During testing, only a group of heat exchangers for the buried tube are needed to be buried, so that the testing cost can be greatly reduced. As the tester can be used for cooling (preparing cold water) and heating (preparing hot water), only one tester can meet the testing requirements of a thermal response method and a simulation method. Therefore, the tester is dual-purpose, and has a wide application range. In addition, the tester has high automation degree.