Mixotrophic scenedesmus and application thereof in sewage resource treatment

The invention relates to mixotrophic scenedesmus and an application in sewage resource treatment. The scenedesmus has strong anti-pollution capability and can grow stably in actual sewage (non-sterile), the heterotrophic capability is strong, the productivity of biomass and grease is high, namely organic matters in the sewage can be transformed to grease, nutrient substances in the sewage can be further utilized for absorbing carbon dioxide in atmosphere, nitrogen and phosphorus in the sewage can be removed in a sustained manner under the situation that an organic carbon source is used up, and when the sewage is taken as a matrix for inoculating the scenedesmus, the water quality can be purified, and the grease can be simultaneously accumulated, so that sewage resources can be effectively utilized, the waste can be changed to valuable things, and the mixotrophic scenedesmus further has the advantages of low operation cost, good quality of outlet water, simple and convenient technology, easiness in popularization and the like.