Construction warning board convenient to replace

The utility model discloses a construction warning board convenient to replace, and relates to the technical field of warning boards, according to the construction warning board convenient to replace, when danger warning needs to be shown on a construction site, two bolts at the top end of a rear supporting frame are firstly unscrewed, the two supporting frames which are originally closed together are unfolded to the needed angle, and then the warning board is replaced. The bolts are tightened and fixed, the two positioning screws on the front supporting frame are unscrewed, the movable display board blocked by the positioning screws is not limited to move up and down any more, at the moment, the movable display board is pulled to a proper position, then the two positioning screws are tightened to fix the position of the movable display board, and a baffle at the top end of the movable display board is rotated; the warning board located on the front surface of the movable display board can be pulled up and do