Building gypsum board flattening and limiting device

The utility model discloses a building plasterboard flattening limiting device which comprises a roller conveyor with two side walls, first mounting seats are fixedly arranged on the two side walls of the roller conveyor, and limiting adjusting mechanisms are slidably mounted on the two side walls of the roller conveyor and located on the opposite sides of the two first mounting seats. And a mounting plate is fixedly arranged at the tops of the two first mounting seats, and a flattening adjusting mechanism is slidably mounted in the limiting adjusting mechanism. According to the flattening and limiting device for the building gypsum board, by arranging the flattening adjusting mechanism, the first scale ruler, the limiting adjusting mechanism and the second scale ruler, when the edges of wet gypsum boards of different models need to be flattened and limited, a second lead screw is rotated to control a flattening plate to move, the first scale ruler is observed to adjust two limiting plates to proper positions