The invention relates to a method for preparing dwarf lilyturf tuber total saponins, which has the innovation that when the dwarf lilyturf tuber total saponins are extracted, fat-soluble components are first removed and then eluted on a column, a part of fat-soluble components are naturally separated out during stirring by using the water absorption and filter aid properties of diatomite and filtered and separated, and a small amount of rest fat-soluble components are adsorbed by using active carbon so as to improve the yield of the dwarf lilyturf tuber total saponins. Compared with a common extracting method, the method for preparing the dwarf lilyturf tuber total saponins has the advantages that: experiments prove that the content of the dwarf lilyturf tuber total saponins D extracted by adopting the method of the invention is improved by 3 times, the extracting rate is remarkably improved, and the obtained dwarf lilyturf tuber total saponins have better activity and higher medicinal value; during eluting, only the elution part containing 30 to 60 percent alcohol is taken, the dwarf lilyturf tuber total saponins obtained in the interval have high content and little impurity, and the extracted dwarf lilyturf tuber total saponins have high activity and higher medicinal value; and the process of the invention is easily implemented in the industry, is expected to be universally popular in the industry after promotion, and has good market prospect.