Microorganism immobilization device

The utility model relates to the technical field of microorganisms, and discloses a microorganism immobilization device which comprises a treatment box body and a water injection port arranged at the upper end of the treatment box body, a wastewater backflow mechanism is arranged on one side of the treatment box body, and a driving mechanism used for driving an arc-shaped body to reciprocate up and down is arranged above the arc-shaped body. Compared with a comparison file, the sewage treatment device has the advantages that the worm gear is driven to rotate through the worm gear while sewage is fully contacted and treated through rotation of the microorganism fixing plate, so that the arc-shaped body can reciprocate up and down, the liquid level of the sewage is higher than the sewage outlet, and the sewage is discharged through the sewage outlet; treated waste materials in sewage are filtered through a filter plate and then flow back into the treatment box body through a one-way valve, so that the sewage is