In order to improve the mechanical property, Konjac glucomannan (KGM) was mixed with nano-Fe₃O₄ to prepare the composite membrane by electrospinning technology. Results indicate that the content of raw materials, including nano-Fe₃O₄, KGM, glycerin, and Na₂CO₃, had considerable impact on the mechanical property of composite membrane. When the ratio of nano-Fe₃O₄, KGM, glycerin, and Na₂CO₃ in the composite membrane was 1.0%, 1.2%, 0.1% and 0.1% respectively, the tensile strength was 28.35 MPa and the elongation at break was 6.42%.