The invention provides a denitration ceramic fiber filter tube. The denitration ceramic fiber filter tube comprises a ceramic fiber filter tube and active nano titanium dioxide particles compounded on the ceramic fiber filter tube, an oxide denitration catalyst is compounded on the surfaces of the active nano titanium dioxide particles. The denitration ceramic fiber filter tube provided by the invention keeps the basic properties of high activity of active ingredients, uniform particle size and particle size distribution, large specific surface area and the like of an original denitration catalyst, the coating loading capacity is high and uniform, the bonding firmness is high, and a macromolecular copolymer layer on the surface of titanium dioxide becomes carbon dioxide, water and the like to be volatilized, so that the denitration effect is good. The porosity, the pressure drop, the strength and the like of the filter tube are not influenced, and adverse factors such as falling, failure and inactivation of active components of the existing catalyst and influence on the performance of a substrate are effectively improved. The denitration catalyst coating type denitration ceramic fiber filter tube is simple in preparation process, free of alcohol solvents, easy to control in production and high in safety, and the denitration catalyst coating type denitration ceramic fiber filter tube adapts to harsh environment-friendly denitration index requirements and has wide market prospects.