The invention discloses a culture medium for promoting growth of scenedesmus and accumulation of lutein. The culture medium comprises a carbon source, a nitrogen source, phosphate, a calcium salt, aniron salt, a plurality of trace elements and vitamins according to a specific proportional ratio, and also comprises valine, leucine, L-selenium-methyl selenocysteine, silver thiosulfate, diphenylureasulfonic calcium, IAA (indoleacetic acid), alpha-ketoglutaric acid, clethodim, nicotine and spinach juice. The culture medium disclosed by the invention has the advantages that by optimizing the carbon source and the nitrogen source, and adding a growth regulator, a precursor compound synthesized and metabolized by the lutein, and a plurality of means for facilitating the accumulation of the lutein, the biomass of the scenedesmus is obviously increased, and the synthesizing and accumulation of the lutein are also obviously increased; by adopting the innovative technique, the good technical effect is realized, the cost is relatively low, the implementation is easy, and the good popularization prospect is good.