Expressway signboard fixing device

The utility model discloses an expressway signboard fixing device which comprises a bottom plate and a guide rod, a connecting rod is fixedly connected to the middle end of the bottom of the bottom plate, a buried plate is fixedly connected to the bottom of the connecting rod, reinforcing rods are fixedly connected to the inner surface of the periphery of the buried plate, and a supporting columnis fixedly connected to the top of the bottom plate. A fixing groove is fixedly connected to the top of the supporting column, a mounting base is arranged on the inner side of the fixing groove, clamping grooves are formed in the inner surfaces of the left side and the right side of the mounting base, and threaded rods are movably connected to the left side and the right side of the fixing groovethrough bearings. Through the action of the connecting rod, the buried plate, the reinforcing rod, the threaded rod, the supporting plate, the clamping block, the clamping groove, the limiting reinforcing bolt and the threaded