The invention relates to an organic sewage constructed wetland processing and high-yield non-food energy plant cultivating technology, which is characterized in that the organic sewage is sent into a methane tank, an oxidation pond and a constructed wetland orderly to achieve the purpose of sewage purification, and simultaneously, the non-food energy plant is cultivated. The invention has the advantages that a buried type ABR system can be ensured to be in an intermediate-temperature fermentation state, the organic matter is digested quickly, and methane is produced with high yield; the methane is used for intensifying light, heating, increasing carbon dioxide fertilizer and enhancing photosynthesis for the system to produce the non-food energy plant with high yield; under the previous condition, plant seeds and energy plants on the oxidation pond (the stabilization pond) and the constructed wetland can grow quickly so as to obtain high yield and produce high-quality protein feed, andthe normal growth and absorption of eutrophic substances in the sewage in winter can be ensured; simultaneously, purified reclaimed water is fully utilized; and the plants inside and outside the system grow quickly, a large amount of carbon dioxide is absorbed and utilized, and zero emission of sewage and methane is realized.