Biological filler bag and application thereof in sewage treatment

The invention provides a biological filler bag for sewage treatment and application thereof. The biological filler bag is made by the following steps: filling a filler substrate in a fiber cloth bag made of fiber cloth, and sealing. The main raw material of the fiber cloth is a polyester fiber, a polypropylene fiber or a mixture thereof; and the diameter of the polyester fiber or polypropylene fiber is 2-8 dtex, and the length is 30-86mm. The biological filler bag provided by the invention has abundant pore sizes and large specific area, and thus, can provide a habitat for aquatic organisms and promote mass proliferation of microbes; and the biological filler bag can be used for growing aquatic plants, and is beneficial to the growth of aquatic animals. The biological filler bag also has the function of filtering impurities in a water body. The biological filler bag is applicable to sewage treatment, and has the characteristics of favorable film forming property, multiple biologic species and favorable pollutant removal effect (especially for N and P in a water body).