Water depth measurer for water conservancy project and working method

The invention discloses a water depth measurer for hydraulic engineering and a working method, and relates to the field of hydraulic engineering, the water depth measurer comprises a working box, supporting legs are uniformly arranged at the bottom of the working box, the bottom of the working box is fixedly connected with the tops of the supporting legs, and the bottoms of the supporting legs are fixedly connected with a suspension box; a rotating rod is arranged in the working box, the inner wall of the working box is rotationally connected with the two ends of the rotating rod, a winding belt is arranged on the outer surface of the rotating rod, the outer surface of the rotating rod is fixedly connected with the inner wall of the winding belt, a detection part is fixedly connected to the bottom of the winding belt, and a bottom plate is fixedly connected to the bottom of the working box. The detection part comprises a detector, and connecting pipes are symmetrically arranged on the outer surface of the det