The invention discloses a vehicle energy-saving air conditioning device which comprises an absorber, a generator, a condenser and an evaporator which are sequentially connected, wherein the absorber is internally provided with a refrigerant, and the outlet of the absorber is led into the generator through a solution pump, a solution heat exchanger and a dilute refrigerant solution pipe of the generator; the generator is internally provided with a tail gas radiating pipe communicated with an exhaust pipe of a vehicle engine; the generator is also provided with a refrigerant steam outlet pipe communicated with the condenser, and the outlet of the condenser is led into the evaporator through a throttle valve; the outlet of the evaporator is communicated with the absorber; and the evaporator is also provided with a concentrated refrigerant solution outlet pipe led into the absorber through a solution heat exchanger. The vehicle energy-saving air conditioning device is suitable for the refrigeration and the heat supply of vehicles and has perfect structure, good air conditioning effect, energy saving and environmental protection.