New method for producing high-yield ethyl lactate by using saccharomyces cerevisiae strain and application of strain

The invention belongs to the technical field of bioengineering, and particularly discloses a new method for producing high-yield ethyl lactate by using a saccharomyces cerevisiae strain and application of the strain. High-yield ethyl lactate is produced through the simultaneous heterologous expression of lactate dehydrogenase, propionyl-CoA transferase and alcohol acyltransferase in saccharomycescerevisiae. Pyruvate decarboxylase is completely knocked out from an original strain, and lactate dehydrogenase is overexpressed to obtain the yeast strain with a certain capability of generating L-lactic acid; a strong promoter TEF1 is selected and adopted for overexpressing propionyl-CoA transferase, a strong promoter PGK1 is selected and adopted for overexpressing alcohol acyltransferase, witha homothallic gene HO as an integration site, a copy number of propionyl-CoA transferase is increased, the saccharomyces cerevisiae strain capable of significantly increasing the yield of ethyl lactate is obtained, and the yie