Central air-conditioning host machine of ground source heat pump

The invention relates to a central air-conditioning host machine of a ground source heat pump. The host machine comprises an enclosed-type compressor module, a valve bank module, a circulation water pump module, an electric control system module and a case, wherein the enclosed-type compressor module, the valve bank module, the circulation water pump module and the electric control system module are installed in the case, a cold water returning port of the compressor module is connected with a cold water returning port of the valve bank module; a cold water outlet of the compressor module is connected with a cold water inlet of the valve bank module through a cold water pump of the circulation water pump module; a hot water returning port of the compressor module is connected with a hot water returning port of the valve bank module; and a hot water outlet of the compressor module is connected with a hot water inlet of the valve bank module through a hot water pump of the circulation water pump module, wherein the electric control system module is installed in the case. According to the invention, the operation noises of the compressor can be reduced greatly; switching between coldwater and hot water can be realized, natural circulation can be realized, domestic hot water is provided, and the effect that one machine has multiple functions is achieved; and the water pump is arranged in a built-in mode and is convenient to install.