Building area measuring device for building engineering

The invention relates to the technical field of area measurement, in particular to a building area measuring device for building engineering. Comprising a mounting base, a first winding box is fixedly connected to the mounting base, a first measuring scale is arranged in the first winding box, a rotating base is fixedly connected to the end, away from the first winding box, of the first measuring scale, a first rotating rod is hinged to the rotating base, and a first fixing shell is fixedly connected to the upper side of the mounting base; the first fixing shell is fixedly connected with symmetrically distributed first limiting plates, a fixing plate is rotatably and slidably connected between the symmetrically distributed first limiting plates, the fixing plate is slidably connected with a limiting column, and the limiting column is fixedly connected with a pointer. After the first measuring ruler is straightened, the fixing plate is fixed to the first measuring ruler, then the first measuring ruler slides a