The invention discloses a compound Sargassum, fruit and vegetable beverage capable of stimulating children's intelligence development and a preparation method of the compound Sargassum, fruit and vegetable beverage and belongs to the field of beverage production. The compound Sargassum, fruit and vegetable beverage is prepared from Dunaliella Salina powder, Isochrysis Galbana powder, Nannochloropsis Oculata powder, scallop juice, Concha Ostreae juice, grape juice, pineapple juice, kiwi-fruit juice, tomato juice, orange juice, Spinacia Oleracea juice, carrot juice and distilled water according to a scientific technology. The compound Sargassum, fruit and vegetable beverage capable of stimulating children's intelligence development is scientific and reasonable in formula, available to raw materials, simple in technology, low in cost, green, natural, unique and harmonized in flavor, mild in taste, free from foreign smell, clear, transparent, cool, refreshing, good in fluidity and natural in faint scent, and is capable of tonifying the spleen, reinforcing the stomach, nourishing the heart, moistening the lung and nourishing the liver and kidney, thereby being suitable for people of all ages and particularly helping stimulate brain development and enhance intelligence of children.