The invention relates to a preparation method of notoginseng leaf total saponins, and belongs to the technical field of natural medicine extraction. The preparation method comprises the following steps: adding a solvent to notoginseng leaves, carrying out ultrasonic wave countercurrent continuous extraction, filtering, collecting filtrate, concentrating to obtain clear paste, adding a natural clarifying agent for clarification, centrifuging, adding ethyl alcohol to a clear solution to ensure that the ethyl alcohol content of the clear solution is 30-50%, and carrying out alcohol precipitation; and purifying the clear solution subjected to alcohol precipitation by using a desugaring resin column, eluting by using ethyl alcohols with different concentrations, decolorizing by using anion exchange resin after desugaring, finally concentrating, and carrying out microwave drying so as to obtain the notoginseng leaf total saponins. The preparation method has the advantages that the obtained notoginseng leaf total saponins are off-white, the texture of the powder is loose, the yield of total glycosides is above 8%, the content of the total glycosides is not lower than 90% (UV-ultraviolet), the obtained notoginseng leaf total saponins mainly comprise Rb3, Rc, Fc, Fa and the like, and the content of the Rb3 is greater than or equal to 40% (HPLC- High Performance Liquid Chromatography); the process is simple, the realization of industrialization is facilitated, and the product quality is substantially improved.