Quick plugging device for wellhead

The utility model discloses a quick plugging device for well mouth, including adaptation rod, casing, fixing mechanism and moving mechanism, the inside of casing is provided with adaptation rod, the outside of casing is symmetrically provided with moving mechanism, one side of moving mechanism is provided with moving block, the inside of moving block is provided with fixing mechanism, the moving block is connected with the casing in sliding mode, the casing is connected with the casing in sliding mode, and the casing is connected with the casing in sliding mode. A cylinder body is arranged at the bottom of the shell, cylinder rods are symmetrically arranged at the top of the cylinder body, connecting blocks are fixedly connected to the tops of the cylinder rods, and a fourth connecting plate is rotatably connected to the interior of each connecting block through a rotating shaft. By adding the moving mechanism, the moving block and the third connecting plate move inwards, by adding the fixing mechanism, the c