Abstract: In view of the shortcomings of the traditional observation methods for the super large area goaf, especially the upper and lower composite goaf, we developed a stereoscopic technology observation device for the super large area upper and lower composite goaf. The technical device integrates the functions of manual sampling, beam tube observation, differential pressure observation and data upload in the goaf through each component, and realizes the underground and surface stereoscopic observation of the goaf. In the practical application process, the technical device not only issued a timely warning when fire signs appeared in the 22307 upper and lower composite goaf in Shendong Bulianta Coal Mine, but also accurately locked the location of the goaf fire area, which made the goaf fire contained within a short time and ensured the safety of mine production.