Flue gas purifying filter material for semi-dry desulphurization and preparation method thereof

The invention discloses a flue gas purifying filter material for semi-dry desulphurization and a preparation method thereof. The flue gas purifying filter material for semi-dry desulphurization is compounded by an expanded polytetrafluoroethylene micropore thin layer and a blended needled felt layer; the blended needled felt is compounded by a blended composite dust facing surface layer, a corrosion resisting enhanced base cloth layer and a blended composite gas cleaning surface layer which are connected in order, wherein the expanded polytetrafluoroethylene micropore thin layer and the blended composite dust facing surface layer are connected. The flue gas purifying filter material for semi-dry desulphurization has warp and weft strength which are higher than 900N/50mm, warp and weft elongation at break which are less than 15%, and high dimension stability; the filter material can tolerate high temperature which is 250 DEG C or above, and application temperate is wide; corrosion resistance is good, and inoxidizability is good; the polytetrafluoroethylene film has smooth surface, and dust-cleaning efficiency is high and reaches 99.999%; the filter material has the advantages of low friction, flame retardancy, insulating properties, and heat insulation property; the material has long service life; and the material has high filtering efficiency, high filtration accuracy, water resistance and corrosion resistance.