Warning board for municipal road construction

The utility model relates to a warning board for municipal road construction, which comprises a protective box, supporting legs fixedly mounted at the bottom of the protective box, supporting seats fixedly mounted at the bottoms of the supporting legs, and a warning board movably mounted in the protective box, and two threaded components are fixedly mounted between the inner top wall and the inner bottom wall of the protective box. The two threaded assemblies are in threaded connection with threaded sleeves, limiting assemblies are arranged between the side walls of the threaded sleeves and the inner wall, close to the protective box, of the threaded sleeves and used for limiting the threaded sleeves, and connecting rods are fixedly installed on the opposite side walls of the two threaded sleeves. According to the warning board for municipal road construction, by arranging the protection box, the fixed bearing, the threaded rod, the threaded sleeve and the driving motor, the warning board achieves the automat