A disclosed road and bridge isolation belt light blocking device comprises a protection box, the bottoms of the left side and the right side of an inner cavity of the protection box are rotationally connected with right-and-left threaded rods through bearings, the left side and the right side of the outer surface of each right-and-left
threaded rod are in threaded connection with sleeves, the tops of the sleeves are movably connected with push plates through movable shafts, a bearing plate is slidably connected to the position, located above the push plates, of the inner cavity of the protection box, the end, away from the sleeve, of each push plate is movably connected with the joint of the bearing plate through the movable shaft, and a driving
assembly is movably arranged on the front face of the inner cavity of the protection box. Through arrangement of the protection box, the right and left
threaded rod, the sleeve, the push plate, the bearing plate, the driving
assembly and a concave frame, the light blocking plate can move, through arrangement of the structure, the light blocking device has the
advantage that the light blocking height can be adjusted when the light blocking device is used, the problem that the light blocking height cannot be adjusted when an original light blocking device is used is solved, and, the light blocking effect is prevented from being influenced.