Underground space drainage structure

The utility model discloses an underground space drainage structure which comprises a U-shaped pipe, one end of the U-shaped pipe is communicated with a water inlet pipe, the other end of the U-shaped pipe is communicated with a curved pipe, a sleeve is fixedly connected to the outer wall of the U-shaped pipe, an installation frame is installed on the outer wall of the sleeve, and the interior of the installation frame is movably connected with the sleeve through a bearing. According to the underground space drainage structure, after a U-shaped pipe is separated from a water inlet pipe and a curved pipe, a bolt is rotated to be separated from a through hole of a rectangular frame, a sleeve is rotated through a bearing in a mounting frame, the sleeve drives the U-shaped pipe to rotate by 90 degrees, the interior of the U-shaped pipe is conveniently cleaned, a rotating disc is rotated to drive a transmission rod to rotate in a transverse plate, and the U-shaped pipe is driven to rotate by 90 degrees. The transm