NOVELTY - Preparing titanium dioxide nanowire comprises adding sodium hydroxide in deionized water and water-soluble chlorate salt and then stirring for completely dissolving to obtain reflecting solution, performing hydrothermal reaction to generate sodium titanate nanowire, transferring prepared reaction solution into a polytetrafluoroethylene liner of a hydrothermal kettle, adding metatitanic acid to obtained sodium titanate nanowire, adding hydrochloric acid and then filtering using deionized water to obtain ultrafine nanowire, and roasting obtained product.    USE - The method is useful for preparing titanium dioxide nanowire (claimed), which is useful for a solar cell, photocatalysis process, water photolysis process, sensor, nanometer electron and nanometer photoelectron device.    ADVANTAGE - The titanium dioxide nanowire has regular size, good crystallinity and large specific surface area.    DETAILED DESCRIPTION - Preparing titanium dioxide nanowire comprises adding sodium hydroxide in deionized water and water-soluble chlorate salt and then stirring for completely dissolving to obtain reflecting solution (1-10 mole), where the concentration of the sodium hydroxide and the chlorate salt additive is 0.1-1 mole, performing hydrothermal reaction to generate sodium titanate nanowire, transferring prepared reaction solution into a polytetrafluoroethylene liner of a hydrothermal kettle, adding titanium foil for sealing obtained product at 160-250 degrees C and then performing hydrothermal reaction for 6-48 hours, scraping and dispersing the titanium foil surface in the sodium titanate solution, adding deionized water and then filtering at 105-130 degrees C to obtain sodium titanate nanowire, adding metatitanic acid to obtained sodium titanate nanowire, adding hydrochloric acid (0.1-2 mole) to obtained product for 5-10 hours and then filtering, washing the filtrate using deionized water at 105-130 degrees C to obtain ultrafine nanowire, and roasting obtained product at 300-1000 degrees C for 0.5-5 hours.    DESCRIPTION OF DRAWING(S) - The figure shows a flowchart of a method for preparing titanium dioxide nanowire (Drawing includes non-English language text).