The invention belongs to the technical field of biological treatment of waste gas and relates to a spherical non-woven fabric filling started tower type anaerobic ammonia oxidation reactor. Filling is of an orange-segment-shape-like structure formed by uniformly arraying a framework, formed by modifying an original polyhedron hollow sphere, and a non-woven fabric. The filling is stacked in an absorption tower and is used for carrying out film formation through spraying anaerobic ammonia oxidation bacterium liquid; artificially synthesized ammonia-nitrogen wastewater is sprayed at the upper part; nitric oxide enters from the lower part of the reactor and is in countercurrent contact with liquid to be removed. The spherical non-woven fabric filling started tower type anaerobic ammonia oxidation reactor has the effects and benefits that a liquid film is easily formed by the spherical filling and absorption of gas is facilitated; the non-woven fabric on the filling has a large specific surface area and a coarse surface; the adhesion, growth and reproduction of anaerobic ammonia oxidation bacteria are facilitated; the removing efficiency of the nitric oxide is easy to improve; compared with traditional biological denitration, the reactor is environmentally friendly and has low operation cost; a sustainable treatment technology combining flue gas denitration and sewage denitrification is provided and has relatively good potential application prospect.