Method for treating blue algae by fast-growing tree

The invention discloses a method for treating blue algae by a fast-growing tree. The method comprises the following steps: conveying water rich in blue algae next to a water area to an irrigation pool by a water pump; conveying water rich in blue algae in the irrigation pool to a fast-growing planting area with a certain slope, fixing blue algae to the surface soil by means of the fixing effect of a fast-growing tree root system to the blue algae and the filtering effect of soil, and returning treated water to a drainage ditch at the edge of a slope of the fast-growing planting area; carrying out self settling on water in the drainage ditch to remove silts and flowing into a water storage pond; opening a gate to release clean water in the water storage pond periodically and returning to the water area. The method disclosed by the invention not only can remove blue algae in the water body, but also can absorb nutritional elements such as nitrogen, phosphorus and potassium in the water body by the fast-growing