The invention discloses a graphene dispersant, which comprises electro-active polymer comprising an aniline oligomer unit. The electro-active polymer can form [pi]-[pi] complex with graphene. The invention also discloses applications of the graphene dispersant, such as dispersing method and dispersion based on the graphene dispersant, and the like. Conductive aniline oligomer derivatives, which can be easily synthesized and have a low cost, are taken as the graphene dispersant; the dispersant and graphene or other nano carbon materials are simply mixed in a dispersion medium, the dispersion degree, dispersion stability and re-dispersion performance of nano carbon material in the dispersion medium are largely improved; moreover, the physical and chemical properties of the carbon materials are not damaged, the operation is simple, and the graphene dispersant is suitable for large scale implementation.