Safety warning device for road and bridge construction

The utility model discloses a safety warning device for road bridge construction, which belongs to the technical field of road bridge construction tools and comprises a placing ring, a first sleeve is fixedly mounted at the upper end of the placing ring, a second sleeve is fixedly mounted at the upper end of the first sleeve, and a third sleeve is fixedly mounted at the upper end of the second sleeve. A fixing box is fixedly mounted in the upper end of the third sleeve, a clamping ring is fixedly mounted at the upper end of the interior of the fixing box, a rotating ball is rotationally clamped in the clamping ring, a laser lamp is fixedly mounted at the upper end of the rotating ball, and a photosensitive switch is fixedly mounted on one side of the upper surface of the clamping ring. Water is injected into the water storage cavity to increase the dead weight of the placement ring, the stability during placement is improved, a three-color warning lamp is arranged to facilitate reminding at night, a laser lam