The invention discloses a fluorene-carbazole copolymerization hyperbranched polymer based on a spirobifluorene kernel. The fluorene-carbazole copolymerization hyperbranched polymer consists of a spirobifluorene nuclear structure unit serving as a first blue light group, and a branched chain structure unit which is connected to the nuclear structure unit and is formed by copolymerizing a second blue light group and a red light group, wherein the second blue light group on the branched chain is an alternating copolymerization substance of a 9,9- dioctyl fluorene unit and an iso octyl carbazole unit, the red light group is a 4,7-2(2'-thiophene)-2,1,3-diazosulfide unit, the average molecular weight of the polymer is 9000-12000, and the molecular weight distribution is 1.5-3. The hyperbranched polymer disclosed by the invention is high in solubility, and used for manufacturing single luminous layer structure devices; not only can the luminous efficiency of the devices and the color stability of the devices be improved, but also the hyperbranched polymer does not have special requirements for substrate selection, so that the fabrication technology can be greatly simplified, and the production cost can be reduced.