Graphene oxide solution for wet spinning and preparation method thereof, graphene fiber and preparation method of graphene fiber

The invention provides a preparation method of a graphene oxide solution for wet spinning; the preparation method includes the following steps: carrying out centrifugal concentration on a graphene oxide solution, to obtain the graphene oxide solution for wet spinning. The graphene oxide solution is subjected to centrifugal concentration so as to obtain the graphene oxide solution for wet spinning finally. The preparation method of the graphene oxide solution for wet spinning simplifies operation processes, and omits ultrasound, dialysis and pre-expansion processes and the like; the experimental preparation process is simple, the conditions are easy to control, and large-scale production can be realized. In addition, the graphene oxide solution used for wet spinning and prepared by the preparation method provided by the invention has the advantages of stable quality, good water solubility, controllable concentration, and easy adjustment of the size of obtained graphene fiber.