Channel water flow cut-off device

The utility model discloses a channel water flow cut-off device, and relates to the related technical field of water conservancy equipment, the channel water flow cut-off device comprises a cut-off plate, the cut-off plate comprises a first vertical plate and a second vertical plate, the first vertical plate and the second vertical plate are formed by symmetrically dividing the cut-off plate along the vertical center line, and a groove is reserved in the middle of the interior of the cut-off plate; a first extension plate consistent with the groove in size is installed in the groove, the first vertical plate, the second vertical plate and the first extension plate are movably connected, a fan-shaped second extension plate is installed in the second extension plate installation groove, and the two planes of the second extension plate coincide with the side face and the bottom face of the cut-off plate correspondingly. The second extension plate is rotationally connected with the second extension plate mounting