Night warning device for road and bridge construction

The utility model relates to the technical field of night warning accessory devices, in particular to a night warning device for road and bridge construction. The device comprises a placing plate, a supporting plate, a display plate and four sets of supports, a writing face is arranged on the front side of the display plate, and illuminating lamps are arranged on the left side and the right side above the front side wall of the display plate; the placing plate comprises an adjusting plate, two sets of supporting rods and a supporting table, an upper sliding way is transversely arranged at thebottom end of the adjusting plate, two sets of upper sliding blocks are slidably fixed to the upper sliding way, a lower sliding way is transversely arranged at the top end of the supporting table, and two sets of lower sliding blocks are slidably fixed to the lower sliding way; the device further comprises a supporting frame and a limiting column, multiple sets of limiting grooves are formed in the limiting column in the