NOVELTY - A highly oriented monocrystal titanium dioxide nanowire array film is prepared by drying fluorine doped stannic oxide; putting into PTFE lining of stainless steel pressure kettle; mixing toluene, tetrabutyl titanate and concentrated hydrochloric acid; sealing pressure kettle and transferring to constant-temperature device; thermally reacting the solvent; naturally cooling and taking out fluorine doped stannic oxide; removing surface residual product; drying; and obtaining titanium dioxide nanowire array film.    USE - Method for preparation of highly oriented monocrystal titanium dioxide nanowire array film used as nanoelectrode assembled nanoapparatus; and as opto-electrical electrode of solar battery.    ADVANTAGE - The method provides film that can increase transmission speed of photoelectron and reduce compounding speed. It is simple, inexpensive, environment-friendly, and easy to industrialize. It is capable of developing solar energy at low cost.    DETAILED DESCRIPTION - Low temperature preparation of highly oriented monocrystal titanium dioxide nanowire array film, comprises:    (A) drying fluorine doped stannic oxide in turn ultrasonically washed with acetone, ethanol and deionized water; putting it into PTFE lining of stainless steel pressure kettle; mixing toluene, tetrabutyl titanate and concentrated hydrochloric acid at a ratio of 10-20:0.5-1.5:0.5-1.5; and sealing the pressure kettle;    (B) transferring the sealed pressure kettle to constant-temperature device; preserving temperature for 1-20 hours at 160-200 degrees C; thermally reacting the solvent; and naturally cooling to room temperature;    (C) opening the pressure kettle cover; taking out the fluorine doped stannic oxide; removing surface residual product; drying at room temperature; and obtaining titanium dioxide nanowire array film directly deposited on the surface of the fluorine doped stannic oxide; and    (D) putting the fluorine doped stannic oxide deposited with titanium dioxide nanowire array film in 0.05 mol% of titanium tetrachloride solution for 30 minutes at 60-70 degrees C; fully rinsing it with deionized water; preserving for 30 minutes at 450 degrees C; and obtaining monocrystal rutile nanowire array film vertical to surface of the fluorine doped stannic oxide.