The present invention provides a linear porous titanium dioxide material and the preparation and products thereof. The linear porous titanium dioxide material has an anatase phase structure and a single crystal structure, and the structure of the linear porous titanium dioxide material is composed of a plurality of particles having an oriented growth direction. The invention also provides a method of preparing the above material and the use thereof. The long axis of structure of the titanium dioxide porous nanowire of the present invention facilitates effective electron migration.