Abstract: A vehicular internal air exhausting device being accomplished by an air exhausting assembly and a power source supply assembly. The air exhausting assembly is mounted on the trunk compartment top plate behind the rear seat or any other suitable place of a vehicle, comprising of a bottom plate which unites all relative components and is positioned fixedly in using place, a motor seat which fixes a motor united with air-extracting blades, and a housing shell for enclosure of the motor and air-extracting blades and union with the bottom plate. When a vehicle is parked under sunlight in hot day, the solar power-collecting plate provided on the roof top of the vehicle will automatically generate light-electricity effects to charge the storage battery of the vehicle and with the electricity power of which the air exhausting assembly will be activated to eliminate the heated internal air out of the vehicle, making the temperature inside equal to the outside.