NOVELTY - Manufacturing octahedrite phase titanium oxide nano-particle processed in high temperature involves (a) dissolving precursor with titanium into organic solvent; dropping into acidified de-ionized solution with soluble carbohydrate; forming even emulsion after stirring; heating in the reactor; picking the obtained product for drying after cooling; (b) heating product obtained by drying in (a), cooling to obtain carbon/titanium oxide composite material; and (c) heating the product obtained in (2), removing carbon intermediate and obtaining nano crystal titanium oxide.    USE - Manufacture of octahedrite phase titanium oxide nano-particle. The prepared nano titanium oxide particle prepared is likely used in photocatalysis fields such as sensitized solar cell and photolysis water-made hydrogen.    ADVANTAGE - The process can realize large-scale preparation of nano crystal titanium oxide which has features such as primary octahedrite phase, small grain size, large specific surface, high crystallinity and low surface state distribution after being processed in high temperature (700-1500 degrees C).    DETAILED DESCRIPTION - Manufacture of octahedrite phase titanium oxide nano-particle processed in high temperature involves (a) dissolving precursor with titanium into organic solvent; volume proportion between added amount of organic solvent and precursor with titanium is 1 (1-100), forming dispersed evenly solution after being stirred; dropping into acidified de-ionized solution with soluble carbohydrate; where mass proportion between carbohydrate and acidified de-ionized solution is 1: (0.05-50), and volume proportion of added amount of acidified de-ionized solution and precursor with titanium is 1 (1-200), forming even emulsion after stirring; heating the emulsion in the reactor at 60-300 degrees C for 5-48 hours; picking the obtained product for drying after cooling at room temperature; precursor with titanium is titanium isopropoxide, tetrabutyl titanate or titanium tetrachloride; organic solvent is glycol, ethanol, methanol, isopropyl alcohol, 4-butanol, ethyl acetate or butyl-acetate; and carbohydrate is sucrose, soluble fecula, glucose, fructose or soluble fibrin; (b) heating the product obtained by drying in (a) for 1-48 hours at 700-1500 degrees C under protection atmosphere, cooling at room temperature to obtain carbon/titanium oxide composite material; and (c) heating the obtained product in (2) for 1-10 hours at 400-1000 degrees C in atmosphere of air or oxygen, removing carbon intermediate, and obtaining nano crystal titanium oxide which can keep to taking octahedrite phase as primary part after high temperature processing, where content of octahedrite phase is 70-100%, size of obtained titanium oxide grain is 5-50 nm, and specific surface is 50-150 m2/g.