Used in an electronic device comprising a cover panel and a base member, a slide cover mounting structure includes two hinges bilaterally mounted on the top wall of the base member, two sliding rail holders respectively connected to the pivot shafts of the hinges, two sliding rails bilaterally mounted on the bottom surface of the cover panel and respectively slidably coupled to a sliding groove on each of the sliding rail holder, two gears pivotally connected between fixed rails on the sliding rail holders, and two gear racks respectively mounted on the cover panel and meshed with the gears. Thus, the cover panel is prohibited from biasing during sliding movement, and turnable about the pivot shafts of the hinges from a horizontal position to a tilted position relative to the base member.