Integral headwaters heat pump and its antifreeze control method

The invention discloses an integral water source heat pump device and an antifreeze control method thereof. The integral water source heat pump device comprises a refrigeration cycle system; the refrigeration cycle system comprises a compressor, a condenser, a liquid storage tank, a throttle element, an evaporator and an antifreeze device which are connected in sequence; the antifreeze device is provided with a bypass valve which is arranged connected between the output end of the refrigerant of the condenser and the input end of the refrigerant of the evaporator; and the bypass valve is arranged in parallel with the throttle element. In addition, the integral water source heat pump device also comprises a waterway system which has a waterway switching system; and the waterway switching system is connected onto the condenser and the evaporator. Thus, the antifreeze device can be used to enhance the antifreeze properties of the evaporator in the unit, while the application of the waterway switching system can reduce the throttle elements so as to improve the operation reliability of the refrigeration system.