The invention discloses a road bridge windshield. The road bridge windshield comprises a base body, a first shield body, a second shield body, reflective strips, sliding grooves, limiting rods, connecting rods, a wind bag, a skeleton, first through holes, second through holes and pulleys. The first shield body is sleeved with the second shield body, and the second shield body and the first shield body are slidably connected. One ends of the pulleys are welded to the surface of the inner side of the second shield body. The sliding grooves are formed in the side faces of the two sides of the first shield body, and the pulleys are embedded in the sliding grooves and movably connected with the first shield body. One ends of the connecting rods are welded to the second shield body, and the other ends of the connecting rods are welded to the skeleton. The wind bag covers the outer side of the skeleton. The first through holes are formed in the two sides of the wind bag. One ends of the limiting rods are welded to the side face of the first shield body. The second through holes are further formed in the bottom ends of the side faces of the two sides of the first shield body. The road bridge windshield is simple in structure, flow dividing can be conducted effectively when wind is strong, and damage to the windshield is avoided.