Camellia oleifera concentrated solution and preparation method and application thereof

The invention provides a camellia oleifera concentrated solution and a preparation method and application thereof. The preparation method comprises the steps that camellia oleifera concentrated solution raw materials are smashed and mixed to obtain camellia oleifera mixed fine materials, solvent extraction is performed on the mixed fine materials to obtain a camellia oleifera extracting solution,membrane filtration separation is performed on the filtered extracting solution to obtain a concentrated camellia oleifera extract, and solvent backflushing is performed to obtain the camellia oleifera concentrated solution. Effective components in the camellia oleifera concentrated solution prepared by the method comprise procyanidine, flavone and polyphenol, wherein the total content of the procyanidine, the flavone and the polyphenol is greater than or equal to 3.8%, and the DPPH free radical scavenging rate is greater than or equal to 85%. The production process is simple, efficient, greenand safe, the content of