Method for preparing composite nanofiber material

The invention relates to a method for preparing a composite nanofiber material. The method includes the steps that PVA is added into threefold-distilled water according to the proportion ranging from 0.9g: 9.21mL to 0.9g:8.5mL, the mixture is heated and stirred till the PVA is completely dissolved, and then the mixture is cooled at an indoor temperature to obtain a solution A; PEI is added into threefold-distilled water according to the proportion of 3g:15mL, and the mixture is heated and stirred till the PEI is dissolved to obtain a solution B; under the indoor temperature, CO2 is led into the solution B, and the mixture is stirred after bubbling lasts for 5h-10h to obtain a PEI-CO2 solution C; the solution A and the solution C are mixed, stirred and kept for one night to obtain a spinning solution D, and the spinning solution D is subjected to electrostatic spinning and drying to obtain the composite nanofiber material. The method is fast, easy and convenient to implement, efficient and low in cost; composite nanofiber films prepared through the method can be used for preparing biological scaffolds, are beneficial for cell adherence and growth and have good application prospects.