NOVELTY - A flexible dye-sensitized solar cell has a seven-layer composite structure containing stainless flexible substrate layer, insulating film layer, titanium film layer, titanium dioxide natural layer, titanium dioxide nanotube array layer, electrolyte layer and flexible counter electrodes on stainless steel substrate. The stainless flexible substrate layer has thickness of 0.1-0.2 nm. The thickness of titanium dioxide natural layer is 40-80 nm, titanium dioxide nanotube array layer is 0.5-20 microns, and flexible counter electrodes are 0.1-0.2 mm.    USE - Dye-sensitized solar cell.    ADVANTAGE - The dye-sensitized solar cell is flexible, economical and has high cell transformation efficiency. The manufacturing method of dye-sensitized solar cell is simple.    DETAILED DESCRIPTION - A flexible dye-sensitized solar cell has a seven-layer composite structure containing stainless flexible substrate layer, insulating film layer, titanium film layer, titanium dioxide natural layer, titanium dioxide nanotube array layer, electrolyte layer and flexible counter electrodes on stainless steel substrate. The dye molecules are embedded into titanium dioxide nanotube of the titanium dioxide nanotube array layer. The stainless flexible substrate layer has thickness of 0.1-0.2 nm. The insulating film layer has thickness of 50-100 nm. The titanium film has thickness of 50-100 nm. The thickness of titanium dioxide natural layer is 40-80 nm, titanium dioxide nanotube array layer is 0.5-20 microns, and flexible counter electrodes are 0.1-0.2 mm. The electrolyte includes iodine ion and iodine molecule. The dye is isocyanate dye chosen from N719 dye, N3 dye, Z907 dye, N749 dye, K77 dye, C101 dye, C102 dye, D102 dye and D149 dye. The insulating layer contains silicon oxide, silicon nitride, aluminum oxide and aluminum nitride. The flexible optical anode is obtained by anodizing the substrate in fluorine-containing aqueous or organic electrolyte. The fluorine-containing aqueous electrolyte is hydrogen fluoride/phosphoric acid/water, hydrogen fluoride/acetic acid/water, hydrogen fluoride/sulfuric acid/water, hydrogen fluoride/nitric acid/water, sodium sulfate/sodium fluoride/water, ammonium sulfate/ammonium fluoride/water or monoammonium dihydrogen phosphate/ammonium fluoride/water. The organic electrolyte, including fluorine is t fluoride solution comprising a solute which is chosen from hydrogen fluoride, sodium fluoride, potassium fluoride and ammonia, and solvent chosen from glycerin, methanol, ethylene glycol, methanamide, dimethyl sulfoxide and N-dimethylformamide.