Heat pump system for vehicle

A heat pump system for a vehicle comprising:

• a refrigerant line which circulates through a compressor, an outdoor heat exchanger, an expansion means, and an indoor heat exchanger, and in which refrigerant circulating through the indoor heat exchanger exchanges heat with air discharged to the interior;
• a first cooling water line which circulates through an engine and a heater core, and in which cooling water circulating through the heater core exchanges heat with air discharged to the interior;
• and
• a second cooling water line which circulates through electric components and an electric radiator,
• wherein a water-cooled condenser is provided between the compressor and the outdoor heat exchanger, and the water-cooled condenser exchanges heat between the refrigerant and either the engine heat from the first cooling water line or the electric heat from the second cooling water line, so the refrigerant discharged from the compressor is primarily cooled in the water-cooled condenser and secondarily cooled in the outdoor heat exchanger during cooling.