Heat pump system and control method and control device of heat pump system

The invention relates to the technical field of heat pump heat exchange, and provides a heat pump system and a control method and device of the heat pump system.The heat pump system comprises an evaporator, a compressor, a condenser, a throttling valve, a heat source pipeline, a hot water pipeline and a heat supplementing pipeline, the heat source pipeline and the evaporator are correspondingly arranged, the evaporator exchanges heat with the heat source, and the temperature of a refrigerant in the evaporator is increased through the heat source; the hot water pipeline and the condenser are correspondingly arranged, the hot water pipeline exchanges heat with the condenser, and hot water is heated through the condenser; the heat supplementing pipeline is communicated with the heat source pipeline and the hot water pipeline, and hot water in the hot water pipeline can be used for increasing the temperature of water in the heat source pipeline. When the temperature of the heat source is low, the hot water in the