Preparation method of TiO2 nano fibers with adjustable crystal phase

The invention relates to a preparation method of TiO2 nano fibers with an adjustable crystal phase. The preparation method comprises a titanium source prehydrolysis process, an electrostatic spinning process and a high-temperature calcining process. By virtue of prehydrolysis, the density of fibers is improved and the calcining determines the composition of the crystal phase of the fibers; and the prepared TiO2 nano fibers can be a pure rutile phase and also can be an anatase phase, or be a mixed phase of the pure rutile phase and the anatase phase. By virtue of the preparation method, the problem that a titanium source is extremely easy to hydrolyze under relatively high humidity is solved; and a prehydrolysis method is adopted so that the problem that the titanium source is hydrolyzed in the electrostatic spinning process, and a needle head is blocked is effectively avoided. The preparation method has a simple process, the requirements on environment conditions are reduced and the process is easy to control.