The invention belongs to the technical field of extraction and purification of
plant ingredients and particularly relates to a method for extracting and purifying
cannabidiol from China-hemp. In the method, an ingredient of
cannabidiol is extracted from floral leaves in a mature period of the China-hemp according to a supercritical CO2 extraction technique, a
cannabidiol extract is further purified by macroporous adsorbent resin and a rapid purification
system, a cannabidiol content of an obtained product is 98% or higher, and the cannabidiol product does not contain a psychotoxic ingredient
tetrahydrocannabinol. According to the method, a chemical
organic solvent is not used in an extraction process, so that the method is environment-friendly and is low in
toxicity and high in efficiency; the loss of cannabidiol in an adsorption
elution process is reduced in a purification process, so that the
impurity ingredients such as
tetrahydrocannabinol and the like are effectively removed, and the use of an organic regent is decreased, so that the purification cost is lowered, and the environmental
pollution is reduced. The product is high in yield and purity, and the requirement for development of a value-added product of the China-hemp, in particular to the market requirement of the
active ingredient of the cannabidiol product in the China-hemp, can be met, and especially, the cannabidiol product has the great application
advantage in the pharmaceutical field.