Method for extracting polyphenol from Cotoneaster multiforus fruits

The invention relates to a method for extracting polyphenol from Cotoneaster multiforus fruits, which is characterized by comprising the following steps: washing the picked Cotoneaster multiforus fruits with water and then mixing the Cotoneaster multiforus fruits with an alcoholic aqueous solution in a certain feed liquid ratio and putting in a refiner for homogenate extraction, and then filtering to obtain an extraction solution; carrying out decompression concentration on the extraction solution until the weight percent of residual alcohol in the concentrated solution is lower than 10 percent; adding an amount of water to the concentrated solution to obtain a water suspension; then extracting the water suspension with an ester solvent; and carrying out the decompression concentration on an ester solvent layer to dryness to obtain the crude product of the Cotoneaster multiforus polyphenol. The operation process has the main characteristics of rich and available raw material resources, fluent process, simple