Braided ribbon fillers are made into curtain fillers based on biological ropes. Braided belt type filler fiber filter material is an environmentally friendly bioactive filler with good water purification efficiency, simulating the form of natural water plants, and is not easy to contain stored sludge. The biological rope made of modified fibers has hydrophilic, oleophilic, cutting effect on bubbles, oxygen storage function, strong adsorption capacity, high biological activity, high mass transfer efficiency, and convenient installation. Braided belt filler is suitable for the treatment of urban domestic sewage, organic industrial wastewater treatment with various concentrations (chemical industry, wool spinning, printing and dyeing, tanning, paper making, pharmaceutical, food and other industries) and the restoration of micro polluted water bodies such as rivers, lakes, ponds and landscapes in anaerobic, anoxic and aerobic environments.