Fecha de publicación: 22/07/2022 Fuente: WIPO "hemp" The invention provides a process for purifying active ingredients of an anti-epileptic drug, which is characterized by comprising the following steps: S1, extracting industrial hemp flowers and leaves by using alcohol circulation according to a Soxhlet extraction method to obtain a cannabidiol alcohol solution extract; s2, uniformly mixing the cannabidiol alcohol solution extract with 90-97 wt% of medicinal alcohol according to a certain mass ratio to obtain a mixture; s3, putting the mixture obtained in the step S2 into a stainless steel barrel, quickly freezing to-75 to-80 DEG C, and standing to obtain refrigerating fluid; s4, after standing is completed, the refrigerating fluid is poured into a layering storage tank to be layered, the upper layer is the cannabidiol crude product alcohol solution, the middle layer is wax grease, and the lower layer is ice crystals; and S5, purifying the upper-layer crude cannabidiol alcohol solution through a rectification device to obtain cannabidiol.