Water supply and drainage water-saving device

The invention discloses a water supply and drainage water-saving device, and particularly relates to the technical field of water supply and drainage water saving.The water supply and drainage water-saving device comprises a reservoir, a drainage pipe is arranged on one side of the reservoir, a rainwater pipeline is arranged at the end, away from the drainage pipe, of the reservoir, and a cleaning device is arranged on the side, close to the interior of the drainage pipe, of the reservoir; the cleaning device comprises a filter screen, the filter screen is fixedly connected with the reservoir, one side of the filter screen is fixedly connected with a placement block, one end of the placement block is fixedly connected with a motor, the output end of the motor is fixedly connected with a threaded rod, and the threaded rod is fixedly connected with the placement block. By means of the cleaning device, cleaning of sundries on the surface of the filter screen can be completed, the situation that through holes of