Biological filter bed for river regulation

The utility model relates to the technical field of riverway treatment, in particular to a biological filter bed for riverway treatment, which comprises a filter cartridge, a sediment discharge port is arranged in the filter cartridge, and a sediment collection box is arranged at the bottom of the filter cartridge; the sand discharging pipe is located on the outer side of the filter cartridge, a movable groove is formed in the sand discharging pipe, a movable strip is arranged in the movable groove, the upper end of the movable strip is fixedly connected with a dredging strip, the inner side of the upper end of the dredging strip is fixedly connected with a dredging block, and a rotating block is arranged on the outer side of the middle of the sand discharging pipe; the fixing plate is located at the bottom of the sand discharging pipe, and the bottom of the fixing plate is fixedly connected with a corrugated pipe; the biological filter bed has the beneficial effects that through the sand discharge pipe in th