Large-scale watershed hydrological analysis device

The utility model relates to the technical field of hydrological analysis devices, and discloses a large-scale watershed hydrological analysis device which comprises a bottom plate, an adjusting device and a detection arm, a fixing plate is arranged on the upper surface of the bottom plate, and the lower surface of the fixing plate is fixedly connected to the upper surface of the bottom plate. An operator rotates the hand wheel to drive the rotating rod to rotate, the rotating rod rotates to drive one set of arc-shaped gear teeth to rotate, one set of arc-shaped gear teeth are rotationally meshed with the other set of arc-shaped gear teeth to rotate, then the detection arm is driven to swing with the movable rod as the axis, and the detection arm is adjusted to the proper angle; an operator rotates a rotating wheel arranged in a through hole formed in the upper surface of the detection arm, the rotating wheel drives a gear to be meshed with a rack to horizontally move, then the telescopic arm is pushed to be