Abstract: In this paper, for the analysis is the current situation of the air leakage which is in the scraper through the windshield, a kind of automatic windshield device designed for the air leakage situation. It can reduce the air quantity of blower which is using the pneumatic driving system and MCU controlling system. It has described in two aspects in detail-the mechanical mechanism and the electrical system. At the same time, the working status is analyzed. The system is reliable which can match the requirements of mine ventilation system and production safety requirements.