The invention discloses a fireproof glass mounting structure, and relates to the technical field of fireproof glass mounting. The fireproof glass mounting structure comprises a fixing base; a limitingclamping groove is formed in the top of the fixing base; fireproof glass is slidably connected with the interior of the limiting clamping groove; a limiting plate is slidably connected with the position, located at one side of the limiting clamping groove, of the top of the fixing base; a plurality of threaded holes penetrating through the fixing base are formed in the inner wall of one side of the limiting clamping groove; extrusion bolts are in threaded fit in the threaded holes; a first limiting sliding groove is formed in the position, above the threaded holes, of the inner wall of the limiting clamping groove; a second limiting sliding groove is formed in the position, below the threaded holes, of the inner wall of the limiting clamping groove; and a positioning block is slidably connected with the interior of the second limiting sliding groove. According to the fireproof glass mounting structure, through the cooperative use of the extrusion bolts, extrusion blocks, a limiting sliding block and the positioning block, the problems that in an existing fireproof glass mounting structure, the fireproof glass mounting process is complex, glass mounting is unstable, and glass is inconvenient to replace in the later period are solved.