NOVELTY - A solar-powered car interior heat exchanging structure for parked car, driven by solar energy, utilities a ventilation device to draw the external air below chassis or engine chamber into the interior for heat exchanging via an air pathway in order to increase car safety as well as comfort. The present invention includes an air pathway carrying the external air below chassis or engine chamber into car interior, a ventilation device installed with the said air pathway, and a solar-powered device. It is capable of circulating and cooling off car interior air by means of drawing the said external fresh air, which is exposing to direct sunshine less and much cooler, into the interior in order to replace stagnant air and exchange heat. The ventilation device is assembled at any given locations either along the air pathway inside or around intakes/outlets of the pathway. The solar-powered device is electrically coupled to the ventilation device, so that the electricity generated by the solar-powered device can be transmitted to the ventilation device, and the ventilation device can draw the said external air into car interior through the air pathway. The air pathway comprises of dedicated ducts, air conditioning ducts, and any given ducts connecting with air conditioning, and also can serve as an external air access for air conditioning system. Therefore, the present invention can not only effectively reduce the interior temperature but also restrain the hazardous gas discharging from leather or plastic interior in order to protect our respiratory organs, and also prevent children from burn, dehydration, or suffocation when left unattended in car by their parents. Due to car interior temperature under being regulated and control, the car interior may deteriorate at a much slower speed and the electronic devices' lifetime can also be extended accordingly. Furthermore, the present invention can prevent and minimize the adverse impacts resulting from immediate startup of air condition system of cars parking in the sun for a period of time. At that circumstance, the engine revs up at higher rotation speed but still below normal working temperature, which results in low energy efficiency and unnecessary wear and tear of engine.