Water supply and drainage device with controllable flow speed

The utility model discloses a water supply and drainage device with controllable flow velocity, which comprises two water supply and drainage pipe bodies with the same ruler diameter, the opposite side surfaces of the water supply and drainage pipe bodies are connected with the same sealing box, the two side surfaces of the sealing box are fixedly connected with connecting flanges, and one end of each connecting flange is connected with one end of each water supply and drainage pipe body; an adjusting part is arranged in the sealing box; the outer wall of the top of the sealing box is fixedly connected with a fixing pipe, and the circumferential outer wall of the fixing pipe and the circumferential outer wall of one water supply and drainage pipe body are fixedly connected with the same pressure relief pipe. An automatic blocking and sealing structure is arranged on the inner wall of the fixed pipe; the adjusting part comprises a partition plate fixedly connected to the inner wall of the top of the sealing bo