Method for separating and purifying effective ingredients in natural product

The invention relates to a method for separating and purifying effective ingredients in a natural product. The method comprises the following steps: 1) extracting effective ingredients of the natural product; 2) removing impurities through membrane separation; and 3) purifying through adsorption. The beneficial effects of the invention are as follows: 1) the separation and purification technological processes are considered from an overall perspective, thus making up the defects of membrane separation in the aspect; 2) compared with the traditional 'water extraction and alcohol precipitation' method, the method of the invention uses water as solvent or adds a certain proportion of ethanol according to the characteristics of effective ingredients of the natural product; 3) compared with the ultra-low temperature freezing technology, the method does not adopt the ultra-low temperature state and is more convenient; and 4) compared with the supercritical or subcritical solvent extraction, continuous operation can be realized at room temperature without phase transition course, the technology is simple and is not harsh to devices, the extraction rate is higher, and the final product has high purity.