Adjusting device for dam drainage

The utility model relates to the technical field of dam drainage, and discloses a dam drainage adjusting device which comprises a connecting dam, a portal frame is fixedly connected to the top end of the connecting dam, a sealing gate is slidably connected to the interior of the connecting dam, and a transmission assembly is fixedly connected to the top end of the portal frame. The top end of the portal frame is rotationally connected with a threaded sleeve, the top end of the sealing gate is rotationally connected with a threaded rod, the outer side of the threaded rod is in threaded connection with the interior of the threaded sleeve, a water guide hole is formed in the front side of the connecting dam, and the rear end of the water guide hole is fixedly connected with a limiting frame. And a protection baffle is slidably connected to the interior of the limiting frame, a limiting assembly is fixedly connected to the top end of the limiting frame, and a hole blocking plate is movably connected to the interi