The invention relates to a preparation method for a preparation of Chinese medicine, particularly relates to a bilobalide injection and a preparation method thereof and belongs to the field of medicine. The technical problem is solved by the invention by providing the bilobalide injection. The bilobalide injection has the advantages of clear components and fixed proportion the bilobalide injection with high purity, clear component and fixed proportion is taken as an active ingredient the content of the effective component is above 95% and the bilobalide injection contains the following components.
