Warning board for highway construction

A warning board for highway construction relates to the technical field of highway construction and is characterized in that a device body comprises two fixing seats, mounting frames are fixedly mounted at the top ends of the fixing seats, and a warning board body is fixedly mounted on the inner sides of the two mounting frames; the supporting mechanism comprises rotating shafts, and the rotating shafts are fixedly installed on the front side and the rear side of the fixing base. After being placed on a use site, the extension seat is held to rotate, the extension seat rotates on the outer side of the rotating shaft at the moment, the outer side of the damping ring is tightly attached to the inner wall of the through hole in the extension seat, stable friction force is provided, and when the extension seat rotates to a vertical state, stable damping can be provided; at the moment, the extension seat is matched with the fixed seat to provide stable support for the mounting frame and the warning board body, so