NOVELTY - Preparing waist-drum shaped anatase titanium dioxide single crystal and microsphere clusters, comprises (i) mixing hydrofluoric acid, nitric acid and water to obtain the pickling solution; (ii) preparing hydrogen fluoride aqueous solution and placing in polytetrafluoroethylene hydrothermal tank; (iii) making the pure titanium wire as electrode, depositing the titanium nitride coating layers on the titanium board; (iv) processing the acid cleaning for titanium board, placing in hydrothermal tank and immersing the board in hydrogen fluoride aqueous solution to obtain the product.    USE - The waist-drum shaped anatase titanium dioxide single crystal and microsphere clusters are useful in photocatalysis and thin film solar cell.    ADVANTAGE - The method: is simple, and produces the products with special patterns and good quality; and produces high light catalytically activated anatase with 001 high-energy crystal face for realizing nitrogen mixing.    DETAILED DESCRIPTION - Preparing waist-drum shaped anatase titanium dioxide single crystal and microsphere clusters, comprises (i) mixing hydrofluoric acid (50-55 %), nitric acid (65-68 %) and de-ionized water based on volume ratio of 1:3:6 to obtain the pickling solution; (ii) preparing hydrogen fluoride aqueous solution (0.6-1.0%), placing the aqueous solution in polytetrafluoroethylene hydrothermal tank, where the volume ratio of hydrogen fluoride aqueous solution and the hydrothermal tank is 4:5; (iii) making the pure titanium wire as the consumable electrode, depositing the titanium nitride coating layers on two faces of the metallic titanium board by the supersonic speed electric arc in air atmosphere, where the thickness of the metallic titanium board is more than 0.1 mm, the thickness of coating layer is 0.15 mm; (iv) processing the acid cleaning for metallic titanium board with titanium nitride coating layers on two faces by the pickling solution, placing the board in polytetrafluoroethylene hydrothermal tank and immersing the board in hydrogen fluoride aqueous solution, reacting the product in hydrothermal manner at 180 degrees C for 5-12 hours, cleaning the product by de-ionized water and drying to obtain the waist-drum-shaped mono-crystal anatase titanium dioxide and clustered micro-sphere attached to the metallic titanium board.