The invention provides a solar ventilation system device for remediation of a contaminated site. The device comprises a solar power supply control system, and an aeration system and an air extraction system, which are distributed in a soil remediation area, wherein the solar power supply control system is used for collecting solar energy and discharging the solar energy to the aeration system and the air extraction system for use; the aeration system is used for delivering air to the soil remediation area; the air extraction system is used for extracting organic contaminants from the soil remediation area. According to the device, the solar energy is adopted for power generation, so that electric energy is effectively saved, and constraints of cost such as the landform and electric wires are broken; soil vapor extraction and ventilation remediation technologies are coupled to rapidly and effectively remove volatile organic matters and biodegradable organic matters in soil; the soil can be safely reutilized after quality improvement and purification; the device is convenient to mount, wide in application range, flexible in operation, lower in running cost and free of secondary pollution.