Adjustable construction site warning board

The utility model relates to the technical field of construction warning boards, in particular to an adjustable construction site warning board, which is characterized in that a transmission screw rod is fixed at the upper end of a turntable, the transmission screw rod sequentially penetrates through a fixed bearing and a base, the warning board is positioned above the base, a movable block is arranged at the rear end of the warning board, and the transmission screw rod penetrates through the movable block; the movable block and the transmission screw rod are matched through a thread structure, after the transmission screw rod rotates, the movable block can be driven to descend through the action of the thread structure, at the moment, the warning board can descend, the bottom end of the warning board can make contact with the base, and therefore the height of the warning board can be adjusted; the height of the warning board can be adjusted in time, the warning board is prevented from being blown down and da