A hydroponic cultivation system includes a plurality of hydroponic cultivation units vertically stacked one over another. Each hydroponic cultivation unit is configured to provide a cultivation bed for the plants. Every two neighboring units are hydrologically coupled to one another such that the culture solution flows top-to-bottom through each hydroponic cultivation units on each level. A plurality of support members, such as pipes, are disposed between, and provide mechanical support for, two hydroponic cultivation units on every two neighboring levels. A light source is disposed over a bottom side of one hydroponic cultivation unit on an upper level and can emit a plant-compatible light to support growth of the plants being cultivated on another hydroponic cultivation unit on a level immediately below the upper level. The hydroponic cultivation system can achieve a vertical recycling of the culture solution.
