The invention relates to a method for preparing periplogenin through enzymatic hydrolysis. The method is characterized in that the method comprises the following steps: 1, taking a medicinal material Cortex Periplocae, crushing, adding 3-8 times of a 80-90% methanol solution, carrying out ultrasonic extraction, recovering methanol through concentrating an extract, adding a proper amount of water to the concentrated extract, carrying out azeotrope, and centrifuging while hot to obtain a centrifugate; 2, adjusting the pH value of the centrifugate to 4.5-5.5, adding a biological enzyme, carrying out insulation enzymatic hydrolysis for 18-32h, carrying out reduced pressure concentration on an enzymatic hydrolysate, and centrifuging to obtain a crude product; and 3, processing the crude product through a high speed counter current chromatograph, collecting a fraction, and drying the fraction to obtain periplogenin. The method of the invention, which has the advantages of low pollution and high yield, is suitable for the industrialization preparation.