Solution mixing and freeze-drying method were used to prepare graphene/polyamide 6 (PA 6) pellets with 0.004% graphene. Then, graphene/PA6 fibers were prepared by the following two processes respectively: one process is that graphene/PA6 pellets were directly used into melt spinning; the second process includes twin screw extrusion for the melting and remixing of graphene/PA6 pellets, granulation and melt spinning. Electronic universal testing machine was used to test the tensile properties of the graphene/PA6 fiber, DSC was used to analyze the melting behavior of graphene/PA6 fibers and calculate the crystallinity, and SEM was used to observe the morphology of graphene/PA6 fiber. Results show that the tensile properties of the fiber are improved by incorporating with a small amount of graphene, the tensile strength and modulus of the graphene/PA6 fiber could rise up to 270 MPa and 9.4 GPa respectively; graphene/PA6 fibers prepared by process one have better mechanical and thermodynamic performance than those prepared by process two; increasing the melt spinning temperature can improve the tensile strength, tensile modulus, melting point and crystallinity of the graphene/PA6 fibers; SEM images show that graphene is uniformly dispersed in the PA6 matrix and the surface of fiber does not present obvious defects.