Weft yarns of glass fiber filter cloth and expanded glass fiber filter cloth are composed of expanded yarns. Because the yarn is fluffy, with strong covering ability and good air permeability, the filtration efficiency can be improved, the filtration resistance can be reduced, and the dust removal efficiency can reach over 99.5%. The product is mainly used for dust reduction in high temperature atmosphere and recovery of valuable industrial dust. For example, industries such as cement, carbon black, steel, metallurgy, electric power generation and coal-fired furnaces.