Disclosed is a heat pump system for simultaneously performing heating and cooling and hot water supply, capable of simultaneously performing both cooling/heating and hot water supply without installing equipment such as a boiler or performing the cooling/heating and the hot water supply independently from each other, supplying cold/hot water with maximum efficiency under any operating conditions regardless of season, and freely controlling a ratio of cold/hot water. The heat pump system for simultaneously performing the heating and cooling and the hot water supply includes: an evaporator for generating cold water by exchanging heat between a refrigerant and water; at least one outdoor unit connected to the evaporator by a first refrigerant circulation line; at least one compressor installed on the first refrigerant circulation line to compress the refrigerant heat-exchanged with the water through the evaporator to a high temperature and a high pressure so as to supply the refrigerant to the outdoor unit; a condenser connected to the first refrigerant circulation line by a second refrigerant circulation line to generate hot water by receiving the refrigerant compressed to the high temperature and the high pressure by the compressor to heat-exchange the refrigerant with water so as to supply the refrigerant heat-exchanged with the water to the outdoor unit; and a first bypass line connected to the refrigerant circulation line so as to supply the refrigerant passing through the outdoor unit sequentially through the second refrigerant circulation line and the first refrigerant circulation line to the compressor after the refrigerant passes through the condenser.
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