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 plate heat exchanger and a first switch valve, 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 an outdoor heat exchanger via a connected or disconnected battery cooling branch, or communicates with a first end of a first branch and a first end of a second branch and communicates with an inlet of the first switch valve via a connected or disconnected battery heating branch; and a refrigerant outlet of the first plate heat exchanger communicates with an inlet of a compressor via a connected or disconnected battery cooling backflow branch and 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; the battery can be cooled and heated, so the battery can work in a proper temperature range.