Breathable alkali-free glass fiber filter material is a filter material with excellent alkali resistance, which is woven from alkali-free glass fiber twisted yarn formed by chemical treatment of glass fiber yarn before weaving. When encountering alkaline gas in the equipment room, the alkali-free glass fiber filter material itself does not have alkali resistance, so it is easily corroded by the gas. At this time, the alkali-free glass fiber cloth woven from the alkali-free glass fiber yarn with alkali resistance can fully adapt to the alkali-containing flue gas filtration, and there will be no corrosion of the filter material.