▎ 摘　　要

NOVELTY - Preparing graphene fibers comprises (i) extruding spinning solution of large pieces graphene oxide with a size greater than 50 mu m through the spinning hole and introducing into coagulation bath to obtain primary graphene oxide fibers, (ii) spinning primary graphene oxide fibers, continuously drawing into a plasticizer and then soaking in a plasticizing bath to make the layer spacing reach 1.1-1.8 nm, (iii) stretching the fibers at a stretching rate of 30%, then applying the external force to maintain the straight alignment of the graphene oxide sheets and releasing stress between sheets, (iv) heating the stretched graphene oxide fibers and then applying the external force to maintains the current length during the heat setting and drying process, and (v) subjecting the dried graphene oxide fiber to chemical reduction and heat treatment to obtain graphene fibers. USE - The method is useful for preparing graphene fibers.