The invention discloses a high-temperature-resistant filtering material with ultra-clean filtering and low-temperature catalytic denitration functions, and a preparation method thereof. The filtering material successively comprises, from a dust-facing surface, an island-type or fragment-type extremely superfine
fiber layer, a superfine
fiber layer, a PTFE sewing-thread base-cloth layer, a fine-denier
fiber layer, a high-temperature-resistant
adhesive layer and a catalyst
coating. The high-temperature-resistant filtering material provided by the invention has the excellent characteristics of a large specific surface area, high
porosity and the like, can realize ultralow dust
discharge and has superhigh
filtration accuracy and good filtering effect; a catalyst is uniform in distribution, firm in loading, high in
catalysis efficiency, good in anti-
sulfur effect and long in service life; the preparation method for the filtering material is simple in process and easy for realization of industrialization; the catalyst is not prone to poisoning and long in service life; and the high-temperature-resistant filtering material is applicable to
flue gas filtering under complex conditions like high
working temperature, great dust content and high requirements on
filtration accuracy, and can realize low-temperature denitration of
nitrogen oxides in
flue gas without extra heating while realizing high-precision filtering.