Wriggling bed

The utility model relates to a wriggling bed. The wriggling bed adopts a multi-stage tandem structure, and comprises a primary pre-processing unit, a secondary biological processing unit and a tertiary depth processing unit, wherein a first sludge sediment area, a water inlet pipe and a first sludge pipe are arranged in the primary pre-processing unit; biological vectors, an aeration system, a second sludge sediment area and second sludge pipes are arranged in the secondary biological processing unit; a third sludge sediment area, a dosing system, a water outlet pipe and a third sludge pipe are arranged in the tertiary depth processing unit. The wriggling bed adopts different efficient microbial strains for compounding according to species of pollutants in sewage, microbes with different functions are fixed into polymeric porous elastic vectors step by step, and transformation of out-of-order biological sewage treatment to ordered biological sewage treatment and conversion of mixed microflora processing to specialized microflora processing are realized.