A promising process for recovering titanium and lithium from waste lithium titanate battery and producing nano TiO2 is proposed. Nano TiO2 is synthesized via homogeneous precipitation with urea as precipitating agent and sodium dodecyl benzene sulfonate(SDBS) as dispersant. The effects of Ti concentration, urea contents, reacting temperature and time on the nano TiO2 production rate and crystal size are studied by weighing and SEM analysis methods. The results indicate that the Ti recovery percentage achieved 90% on the conditions of Ti ion concentration of 60 g/L, SDBS mass fraction of 1.5% and n(CO(NH2)2)/n(TiOSO4) ratio of 3 at 90 ℃ for 2 h. The SEM image of the hydrolyzed product indicates the nano TiO2 particle size is about 100 nm. The approach presents a new way to prepare nanometer titanium dioxide.