Drainage system in greenhouse

The utility model discloses a greenhouse internal drainage system which comprises roofs, a gutter is fixedly connected between the two roofs, a U-shaped connecting block is connected to the outer side of the bottom of the gutter through a fixed connecting structure, a threaded groove is formed in the inner side of the U-shaped connecting block, the U-shaped connecting block is connected with threads in a screwed mode through the threaded groove formed in the inner side, and the gutter is connected with the U-shaped connecting block in a screwed mode. The lower surface of the thread is fixedly connected with the outer surface of a connecting ring, the connecting ring is connected with a hose through a movable rotating structure, a thread structure is additionally arranged on a connecting opening of a connecting block of the U-shaped funnel, a movable connecting structure of a middle connecting element is matched, and the inner drainage pipe is connected to a gutter of a greenhouse. And through the threaded con