Safety warning device for urban construction

The utility model relates to the technical field of urban construction accessory devices, in particular to a safety warning device for urban construction, and the height of a warning plate can be adjusted according to needs. Comprising a bottom plate, stand columns and a warning plate, and an indicating arrow is arranged in the center of the front side wall of the warning plate; the device comprises a stand column, and further comprises a sliding column, a fixing plate, a first supporting plate, a second supporting plate, a first connecting rod, a second connecting rod, a middle plate, a sliding plate, a rotating rod and a rotating disc, a sliding groove is formed in the central area of the top end of the stand column, and a fixing groove is formed in the upper half area of the right side wall of the stand column; external threads are arranged in the right half area of the outer side wall of the rotating rod, a threaded hole is transversely formed in the central area of the left side wall of the middle plate,