Plant composition as well as preparation method and nutritional health-care product thereof

The invention relates to a plant composition, a preparation method thereof and a nutritional health-care product. The plant composition comprises the following raw materials in parts by weight: 2-20 parts of kelp, 1-10 parts of Chinese wolfberry, 0-10 parts of lycium ruthenicum, 0-10 parts of aronia melanocarpa, 1-10 parts of red dates and 1-10 parts of spina date seeds. On one hand, aiming at the problems that plant cell walls are difficult to degrade, insufficient in absorption and utilization and high in starch content, the invention discloses a method for converting cell wall polysaccharides and plant proteins into oligosaccharide, oligopeptide and other small molecular components with the weight-average molecular weight of less than 2000 Daltons by treating plant compounds with a composite enzymolysis technology; on one hand, polysaccharide components such as cellulose and pectin are converted into high-activity oligosaccharide, protein is converted into polypeptide, starch is converted into glucose, on