▎ 摘　　要

NOVELTY - Preparing a composite fiber involves: (S1) dispersing graphene oxide in deionized water, adding sodium dodecylbenzenesulfonate and sodium hydroxide and stirring for 30 minutes; (S2) washing the resulting mixture obtained in the step (S1) to remove excess impurities to obtain a sulfonated graphene oxide, and then dispersing in deionized water; (S3) adding strong acid ions to make the pH value of the mixed solution to 3, dripping a spinning solution of poly(p-phenylenebenzobisoxazole) (PBO) into the mixed solution, and heating in a water bath at 90 degrees C for 1 hour; and (S4) adding a reducing agent to control the reaction conditions to reduce graphene to obtain a spinning solution, which is combined with the sulfonated graphene and PBO, and carrying out electrospinning. USE - The method is useful for preparing a composite fiber, which is useful for bearing layer of unmanned aerial vehicle. ADVANTAGE - The method prepares the composite fiber with high strength and dispersibility, effectively prevents the accumulation of graphene, and effectively avoid the defects of low strength of the bearing layer in the existing materials. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for the composite fiber prepared by the above method.