Purification method of cannabidiol

The invention provides a purification method of cannabidiol. The purification method comprises the following steps: removing a large amount of impurities from an extract of an industrial cannabidiol crude extract by a solvent method, and directly crystallizing and re-crystallizing to prepare high-purity cannabidiol. The purification method does not need expensive chromatography equipment, large heat supply equipment or concentration equipment, and the problem that the cannabidiol production investment is large is solved. Because a large amount of solvent and heat energy is not consumed in theproduction process, compared with a chromatography process, the production cost is greatly reduced. 本发明提出一种大麻二酚的提纯方法，将工业大麻粗提物的浸膏，通过溶剂法去除大量杂质后，直接进行结晶和重结晶，制取高纯度的大麻二酚。本发明不需要价格昂贵的层析设备，不需要大型的供热设备和浓缩设备，解决了大麻二酚生产投资大的问题。由于生产过程中没有大量的溶剂和热能的消耗，与层析工艺相比，生产成本大幅降低。