Perpendicularity detection ruler for constructional engineering

The utility model relates to the technical field of engineering surveying, and discloses a vertical detection ruler for constructional engineering, which comprises a base, two fixing holes are formed in the inner wall of the front side of the base, a placement cavity is formed in the inner bottom wall of the base, a first rotating shaft is rotatably connected between the inner walls of the front side and the rear side of the base, and a fixed ruler is fixedly connected to the outer side of the first rotating shaft. A limiting block is slidably connected to the bottom side of the interior of the fixed ruler, a clamping block is fixedly connected to one side of the limiting block, a spring is fixedly connected to the other side of the limiting block, a driving assembly is arranged on the middle side of the interior of the limiting block and comprises a second rotating shaft, and the outer side of the second rotating shaft is rotatably connected to the interior of the fixed ruler. According to the utility model,