A local light-emitting road sign board apparatus is disclosed. Local light-emitting panels, displaying road guides in the form of a character, numeral, symbol, or figure, are independently inserted and installed in openings for road sign units that are provided in a main substrate. A sub substrate and a retroreflective sheet are laminated and bonded on each local light-emitting panel so as to form a road sign unit. A retroreflective sheet is also bonded on the main substrate so as to form the background of a road sign unit. When one of road sign units fails, it is possible to simply separate, repair or replace, and reinstall only the failed road sign unit while leaving the others intact.