The utility model relates to a self -adaptation microalgae growth's illumination system belongs to optics technical field. Illumination system configuration has the light source device, controlling means, installation interface and self -adaptation device, the self -adaptation device is provided with identity information module, communication interface, the fixed mechanical interface that uses, the illumination system is still including cloud database, little algae culture dish information, self -adaptation apparatus information, light source apparatus information, control apparatus information have been stored in the cloud database. The utility model discloses an useful part is: the environmental information who locates the light source device's information and little algae culture dish through the self -adaptation device sends cloud database to, carries out the analysis through cloud database to the data of collecting to finally carry out feedback control through controlling means to the light source device, the utility model discloses simple structure, convenient operation, the cost is lower.