Abstract: Polypropylene non-woven supported calcium alginate (CaAlg/PP) hydrogel composite filtration membranes were fabricated without porogen. The morphology, structure and thermal stability of the CaAlg/PP membranes were characterized by SEM and TG. The antiswelling property, dyes adsorption and dyes rejection properties of the CaAlg/PP membranes were researched. The results show that the antiswelling properties of CaAlg/PP membrane are greatly improved compared with free-standing CaAlg hydrogel filtration membrane. When the concentration of sodium chloride is 1 g·L^-1, the flux of the CaAlg/PP membrane reaches 9.5 L(m²·h)^-1 under 0.1 MPa and the rejection of brilliant blue is 98.3%. The pressure resistant performance of CaAlg/PP membrane is far better than CaAlg filtration membrane and can be reused multiple times after Ca²⁺ cross-linking. The adsorption rate of anionic dyes is low, reducing the CaAlg/PP membrane fouling. The CaAlg/PP membrane can be used in dye desalination with a low salt concentration.