NOVELTY - A photoanode is prepared by immersing fluorine-doped tin oxide glass in titanium tetrachloride, baking, scrape-coating titania paste, annealing, cooling, and immersing in dye. A photocathode is prepared by washing and drying fluorine-doped tin oxide glass, depositing reduced graphene oxide/carbon nanotube/polyethylene glycol gel on glass, and annealing. A resin square ring is arranged between the anode and cathode, and melt-bonded in a battery pack. An electrolyte in injected and the resin holes are plugged to obtain a dye-sensitized solar cell.    USE - Preparation of high-efficiency dye-sensitized solar cell using graphene/single walled carbon nanotube composite film as counter electrode (claimed).    ADVANTAGE - The method enables economical preparation of high-efficiency dye-sensitized solar cells having excellent photoelectric conversion efficiency. The thermal stability difference of reduced graphene oxide, carbon nanotubes, and polyethylene glycol is utilized to remove polyethylene glycol in a mode of high-temperature heating to form a reduced graphene oxide/carbon nanotube film without using an adhesive. The film has high electroconductivity and strong catalytic ability, and can effectively electrochemically catalyze and reduce triiodide ion as counter electrode. Under AM1.5G sunlight (100 mWcm-2), the photoelectric conversion efficiency is 8.37% and higher than the photoelectric conversion efficiency of a standard platinum electrode by 7.79%. Since the photocathode has high electroconductivity and strong catalytic ability, electron transfer and electrochemical catalytic reduction are facilitated.    DETAILED DESCRIPTION - A photoanode is prepared by drilling a small hole on a cleaned fluorine-doped tin oxide glass, immersing in 10 ml 40 mM titanium tetrachloride after drying for 30 minutes at 75 degrees C, baking at 75 degrees C for 30 minutes, scrape-coating titania paste (DSL 18NR-T and WER2-O), annealing at 500 degrees C, cooling to 80 degrees C, and immersing in N719 dye for 20-24 hours. A photocathode is prepared by washing and drying fluorine-doped tin oxide glass, mixing reduced graphene oxide and polyethylene glycol for 20 minutes, adding single walled carbon nanotubes, ultrasonically processing for 20 minutes, grinding the mixture for 30 minutes, centrifuging the mixture into upper layer of excess polyethylene glycol and lower reduced graphene oxide/carbon nanotube/polyethylene glycol gel, depositing the gel on glass with an area of 7x 7 mm, and annealing by heating at 10 degrees C to 450 degrees C for 5 minutes to form graphene oxide/carbon nanotube film. The mass ratio of reduced graphene oxide or carbon nanotubes, and polyethylene glycol is 1:200. A Surlyn (RTM: ionically crosslinked thermoplastic resin) square ring with an outer length of 9x 9 mm and an inner side length of 8x 8 mm is arranged between the anode and cathode, and melt-bonded to the anode and cathode at 120 degrees C in a battery pack. 3 mu l Electrolyte in injected into the battery pack and the resin holes are plugged to obtain a dye-sensitized solar cell. The photoelectric anode comprises fluorine-doped tin oxide glass, titania gel (DSL 18NR-T and WER2-O), di-tetrabutylammonium cis-bis(isothiocyanato)bis(2,2'-bipyridyl-4,4'-dicarboxylato)ruthenium(II). The solar cell comprises a redox electrolyte provided between the anode and cathode, preferably iodide ion/triiodide ion dissolved in an organic solvent.