Tunnel excavation section supporting structure

The utility model discloses a tunnel excavation section supporting structure which comprises a steel arch and a reinforced concrete layer. Bases are arranged at the two ends of the bottom of the steel arch, a bottom supporting assembly is detachably arranged between the two bases and comprises two bottom supporting plates, the two bottom supporting plates are movably connected, and the ends, away from each other, of the two bottom supporting plates are movably connected with inserting plates. The base is provided with an insertion groove matched with the insertion plate. A plurality of telescopic assemblies are detachably connected to the top of the bottom supporting assembly, a top supporting plate is fixedly arranged at the tops of the telescopic assemblies, a plurality of supporting rods are movably connected to the top of the top supporting plate, and each supporting rod is sleeved with a threaded sleeve; a plurality of fixing rods matched with the threaded sleeves are fixedly arranged on the inner side o