Vehicle heat management system

Disclosed is a vehicle heat management system capable of reducing power consumption of an electric compressor, simplifying a line, and reducing weight and cost by reducing the number of heat exchangers and refrigerant valves. A heat management system for a vehicle is provided with: a heating heat exchanger for heating air by exchanging heat with air in an air conditioner case; a cooling heat exchanger that exchanges heat with air in the air conditioner case and cools the air; a refrigerant line circulating in the compressor, the condenser, the expansion valve, and the cooler; a first cooling water line that passes through the heating heat exchanger and exchanges heat with the condenser of the refrigerant line; a second cooling water line that passes through the cooling heat exchanger and exchanges heat with the cooler of the refrigerant line; a heat sink that exchanges heat between the cooling water and outdoor air; the third cooling water line passes through the radiator and exchanges heat with a battery of