The invention relates to the technical field of extraction of effective active ingredients of plants, and provides a method for extracting and purifying curcumine in
curcuma oil resin, which is characterized in that a mixing adsorption-
elution-
crystallization integrated process is adopted, and an adsorption material and a
solvent system are optimized to realize process simplification and resource circulation. The method comprises the following steps: dissolving
curcuma oil resin, adding one or more adsorption materials for adsorption extraction, eluting with a first
solvent, and filtering and concentrating the eluent to obtain an extract; and adding a second
solvent into the extract, heating, dissolving, adding into a crystallizing tank, adding a certain proportion of
seed crystal, crystallizing, and centrifugally
drying to obtain the
curcumin. The purity of the obtained
curcumin is greater than 95%; a single
solvent system is used for replacing a traditional mixed solvent, the technological process is simplified, the solvent
recovery efficiency is improved, the production cost is reduced, the adsorption material can be reused after being treated, and resource waste is further reduced.