A car heat management system comprises a battery circulating loop, an air conditioner refrigeration loop and a heat management controller, the battery circulating loop comprises a first battery pipeline, a power battery, a battery heat radiator and a heat exchange assembly, and the power battery, the battery heat radiator and the heat exchange assembly are connected to the first battery pipeline. The heat exchange assembly is used for carrying out heat exchange between the battery circulating loop and an external loop. The air conditioner refrigeration loop comprises a first refrigeration pipeline, a second refrigeration pipeline, a fan, a compressor, a condenser and an evaporator, and the compressor, the condenser and the evaporator are connected to the first refrigeration pipeline. The second refrigeration pipeline is connected with the heat exchange assembly, the two ends of the second refrigeration pipeline are connected to the positions, at the two ends of the evaporator, of the first refrigeration pipeline, and the condenser and the battery heat radiator are arranged on the air outlet side of the fan. The heat management controller is used for selectively starting the fan or the compressor to cool the power battery according to the cooling need of the power battery and the environment temperature. The car heat management system is correlated and integrated with a car air conditioning system, the heat load of the air conditioning system can be balanced, and the energy saving effect is good. The invention further relates to a car.