In this paper, a device for detecting and locating the fault location of GIS flashover is designed by using PVDF flexible piezoelectric thin film.In order to verify the reliability of GIS fault fast positioning system based on PVDF piezoelectric film sensor, four different kinds of typical defects were set, and the practical research on GIS flashover positioning was carried out. The result shows that by comparing sound intensity of different gas rooms, GIS fast fault location system based on PVDF piezoelectric film sensor can quickly and efficiently located GIS fault location,and avoid cumulative damage to GIS insulation caused by duplication of pressure.