Coral sand-based bio-membrane reactor

The invention provides a coral sand-based bio-membrane reactor. The coral sand-based bio-membrane reactor comprises a reactor shell, a carrier and a floating body, an opening is formed in the top of the reactor shell, the interior of the reactor shell is divided into at least four areas, at least two opposite carrier areas and at least two opposite clear water areas are formed, and the carrier areas and the clear water areas are arranged at intervals; the carrier areas are respectively provided with carriers, and the clear water areas are respectively provided with floating bodies; the bottom of the carrier area is provided with a water inlet, and the bottom of the clear water area is provided with a water outlet; water entering the carrier area through the water inlet can flow into the clear water area from the top, and water in the clear water area can be discharged through the water outlet; the carrier is connected with the floating body, and the floating body can drive the carrier to move up and down in t