Benthic diatom cultivating device

The invention provides a novel device and a novel method for cultivating benthic diatoms. Under the condition that the cultivating environment is controllable, the benthic diatom cultivating device makes full use of a water space for achieving stereo high-density cultivation of the benthic diatoms. The benthic diatom cultivating device is high in water utilization rate, and can make full use of photosynthetic CO2; cultivated microalgae are large in biomass.