NOVELTY - The sewage treatment filling device comprises a floating ball (1), a mesh bag (2), a porous active filler block (3), a base (5) for sinking filling device in water, and a substrate made of a porous material with certain strength and corrosion resistant function. The porous active filling block contained in the mesh bag. The floating ball and the base are placed on two ends of the mesh bag and are fixedly connected with the mesh bag. The floating ball is made of plastic or rubber or foam with excellent buoyancy. A diameter of the porous active filler block is larger than the diameter of bag.    USE - The filling device is useful for wastewater treatment.    ADVANTAGE - The filling device is simple to manufacture, has good exchange interface, and ensures efficient treatment of wastewater with high quality.    DETAILED DESCRIPTION - The sewage treatment filling device comprises a floating ball (1), a mesh bag (2), a porous active filler block (3), a base (5) for sinking filling device in water, and a substrate made of a porous material with certain strength and corrosion resistant function. The porous active filling block contained in the mesh bag. The floating ball and the base are placed on two ends of the mesh bag and are fixedly connected with the mesh bag. The floating ball is made of plastic or rubber or foam with excellent buoyancy. A diameter of the porous active filler block is larger than the diameter of bag. The floating ball and the porous active filler block on the one bag are composed of a first packing unit. The base is made of cement or stone, and is provided with packing elements. The substrate embeds in its circumferential surface and is internal to form the gel so as to obtain the porous active filling piece provided with the specific pollutant degradation function to the micro-organism fixing hole in porous material piece in the process of substrate gel, and is sponge block or volcanic or corallite. The microorganism is polyvinyl alcohol by embedding method or calcium alginate embedding method. The microorganism is nitrifying bacteria, aerobic bacteria, denitrifying bacteria, and sulfide degradation bacteria.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic view of a filling device.    Floating ball (1)    Mesh bag (2)    Porous active filler block (3)    Base. (5)