The invention relates to a high-efficiency environment-friendly compound vegetable protein used as Cynoglossus semilaevis feed, which is prepared from the following components in percentage by weight: 13-20% of gluten powder, 17-25% of bean pulp, 21.7-33.79% of corn protein powder, 10.93-15.5% of cotton seed pulp, 10-16.5% of peanut pulp, 0.55-0.75% of L-threonine, 1.03-1.13% of L-lysine hydrochloride, 0.9-0.98% of L-methionine, 1.25-1.45% of taurine, 2.3-3.1% of mineral mixture, 0.71-0.91% of calcium biphosphate, 0.11-0.15% of ferrous sulfate monohydrate, 0.04-0.12% of zinc sulfate monohydrate and 0.48-0.62% of phytase. The invention effectively substitutes fish meal protein, does not influence the survival and growth of Cynoglossus semilaevis, feed efficiency, biochemical composition, physiologic index and sensory quality of muscles, and lowers the phosphorus content in the water body and the cost.