Fluid three-way reversing valve and water source heat pump system

The invention relates to the field of pipeline bidirectional flowing fluid and provides a fluid three-way reversing valve and a water source heat pump system. The fluid three-way reversing valve comprises a valve body and a valve core capable of moving in the valve body. A first connector, a second connector and a third connector are formed on the valve body. The valve core is originally located in a first position, so that the first connector is closed, and the second connector communicates with the third connector. When fluid is injected into the valve body from the first connector, the valve core is driven to a second position by the fluid, thus, the second connector is closed, and the first connector communicates with the third connector. According to the fluid three-way reversing valve, the valve core of the fluid three-way reversing valve is controlled by the fluid at the first connector, accordingly, automatic reversing of the fluid three-way reversing valve is achieved throughcontrol of the fluid at t