▎ 摘　　要

NOVELTY - The preparation method of composite fiber material involves immersing 10-50 mg polyimide fiber in 10 ml ethylenediamine solution and then mixing, processing the mixture for 20 minutes to 1 hour and then washing using deionized water, adding 1-5 g graphene oxide and 4-20 ml deionized water to the mixture and then ultrasonically processing for 20-30 minutes, drying the mixture at 40-50 degrees C, adding 1.8-3.6 g sodium borohydride and 45-90 ml deionized water to the mixture and then reacting for 1-2 hours, adding deionized water to the mixture, and ultrasonically processing. USE - The method is useful for preparation of composite fiber material (claimed). ADVANTAGE - The method enables preparation of composite fiber material in simple and rapid manner. DETAILED DESCRIPTION - The preparation method of composite fiber material involves immersing 10-50 mg polyimide fiber in 10 ml ethylenediamine solution and then uniformly mixing, processing the mixture for 20 minutes to 1 hour and then washing using deionized water, adding 1-5 g graphene oxide and 4-20 ml deionized water to the mixture and then ultrasonically processing for 20-30 minutes, drying the mixture at 40-50 degrees C, adding 1.8-3.6 g sodium borohydride and 45-90 ml deionized water in a mass ratio of 1:(0.56-1.40) to the mixture and then reacting for 1-2 hours, adding deionized water to the mixture, and ultrasonically processing for 5-10 minutes.