NOVELTY - A titanium dioxide film preparing method involves heating ethylene glycol and agitating. Isopropyl titanate and citric acid are added to the agitated product, heated and then agitated. The obtained sol is mixed and agitated to obtain a titanium dioxide colloid. The colloid is uniformly paved and scrapped on fluorine-doped tin oxide, and dried. The dried product is annealed and cooled. The colloid is again subjected to paving, scraping, drying, annealing and cooling. The obtained two layers of films are introduced into alcohol solution of ruthenium dye and soaked. The film is washed and dried.    USE - Method for preparing a titanium dioxide film for manufacturing a dye-sensitized solar cell.    ADVANTAGE - The method enables manufacturing the dye-sensitized solar cell with high conversion efficiency at low light intensity, which reaches to 11.83 % with the light illumination of 5 Mw/cm2.    DETAILED DESCRIPTION - A titanium dioxide film preparing method involves weighing raw materials such as isopropyl titanate, citric acid and ethylene glycol according to a mole ratio of 1:5:20, respectively. The ethylene glycol is heated to 60-70 degrees C and agitated. The isopropyl titanate is added to the agitated product. Finally, the citric acid is added, heated to 85-95 degrees C and agitated at constant temperature until the solution is clear to obtain a sol. The sol is mixed and agitated for 1-2 hours in a grinding bowl according to a mole ratio of isopropyl titanate and titanium dioxide to obtain a uniform titanium dioxide colloid. The titanium dioxide is dripped on a position that is not covered with transparent gelatin dipped with fluorine-doped tin oxide (FTO). The titanium dioxide colloid is uniformly paved and scrapped on the FTO, and dried for 25-30 minutes at 100 degrees C. The dried product is annealed in a thermal treating furnace for 50-70 minutes at 450 degrees C and cooled to 80-100 degrees C to obtain a film layer. The dripped colloid is again subjected to paving, scraping, drying, annealing and cooling to obtain two layers of colloid films. The two layers of films are introduced into alcohol solution of ruthenium N719 dye (0.4-0.6 mmole/L) to obtain dye-sensitized titanium dioxide film anode and soaked for 24-30 hours. The film is taken out, washed through alcohol solution and naturally dried.