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, an engine cooling system, a first switch valve 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 outlet of a compressor via a selectively connected or disconnected battery heating branch; a refrigerant outlet of the first plate heat exchanger communicates with an outlet of the first switch valve via a battery heating backflow branch. Therefore, inside vehicle refrigeration and heat can be met; battery cooling and heating functions can be also achieved, so the battery can work in a proper temperature range; and battery charging and discharging efficiency can be improved, cruising ability and service life can be improved.