The invention discloses an automobile heat managing system and an electric automobile. The automobile heat managing system comprises a heat pump air conditioning system, a battery pack heat exchanging system, a first switch valve, an engine cooling system and a first plate heat exchanger, wherein the heat pump air conditioning system and the engine cooling system exchange heat with the battery pack heat exchanging system respectively via the first plate heat exchanger; a refrigerant inlet of the first plate heat exchanger communicates with an inlet of the first switch valve via a connected or disconnected battery heating branch, or communicates with an outlet of the first switch valve via a battery heating backflow branch. Therefore, inside and outside vehicle refrigeration and heat can be achieved; a battery cooling and heating function can be achieved, so the battery can work in a proper temperature range; and battery charging and discharging efficiency can be improved and duration and service life can be enhanced.