The invention discloses a microbiological leaching method for ilmenite and belongs to the field of hydrometallurgy. The invention provides a method for leaching titanium from the ilmenite utilizing the microbiological leaching principle in order to remedy the defects that energy consumption is high, conditions are complicated and pollution is serious by means of a sulfuric acid method production process for extracting the titanium from the ilmenite in the prior art. According to the microbiological leaching method, ferrous oxide thiobacillus is selected as a mineral leaching stain, after the ferrous oxide thiobacillus is cultured in a large scale, an ilmenite sample is inoculated, on the basis of controlling the conditions such as the PH value and temperature and by means of microbiological mixing leaching, after the reaction lasts for 4-6 h, the titanium leaching rate of the ferrous oxide thiobacillus is 93-99%. The microbiological leaching method is simple and reliable in principle; the strain is easy to acquire; sewage discharge is reduced; good economic benefits are obtained while the environment is protected; a new idea about the reclamation of titanium resource is provided; and the microbiological leaching method has good industrial application prospects.