The optical bioreactor is applicable for cultivating algae. During the reaction, sufficient light projection is provided. Optical bioreactor has LLS and LLG. On the both external sides of LLS is the temperature-controlled circulation water jacket. Within the wide face, guillotine is installed in the cultivator to feed in air for mixture with culturefluid. The transparent glass tube of the optical cultivator is fitted with artificial light source. Under the tube is temperature-controlled circulation water jacket. Mechanical agitator blades are installed for cultivating algae of high density