The invention discloses a preparation method of stable graphene colloid. Inorganic nanoparticles (such as carbon nanometer quantum dot, oxidized graphene, acidified nanotube, and graphene quantum dot) are used, a surfactant (such as 3-[3-cholamidopropyl)dimethylammonium]-1-propanesulfonate, dihexadecyldimethylammonium bromide, cetyl dimethyl benzyl ammonium bromide, n-hexadecyl-beta-D-maltoside, and a polymer (octadecanol ethylene oxide polyether, cellulose nanometer crystal) and one or several kinds of additives are assisted; high speed mixing and shearing, ultrasonic exfoliation and dispersion of graphite or graphene are carried out, in order to obtain long-term stable graphene colloid. The method is simple, the graphene colloid is long-term stable, the graphene colloid can be divided into water-soluble colloid and oil soluble colloid, in order to facilitate practical application of graphene. After pumping filtration of the graphene colloid is carried out and film is formed, the film is hopeful to be used as a graphene electrode, a graphene composite material, a graphene coating, and a graphene fiber composite material.