The invention discloses fastfood dandelion and a preparation method thereof. The fastfood dandelion is prepared from the following raw materials: dandelion, laminaria japonica, cucumbers, white sesame seeds, salt, lactic acid bacteria, flavouring, soybean oligosaccharides, olive oil, fructus lycii, cinnamon, ginger slices, citrus and Chinese prickly ash. The preparation method of the fastfood dandelion is simple; the fastfood dandelion has rich nutrition, tastes crisp, sour and sweet, is high in pharmaceutical value, and has effects of diminishing inflammation and relieving pain, degrading cholesterol, reducing weight, keeping fit, protecting skin and resisting tumor; fresh and tender stem leaves of the dandelions are selected and are blanched by flavoring water, the laminaria japonica and cucumbers are added in the dandelions, and the fastfood dandelion tastes delicious; a vacuum freeze drying method is used, the fastfood dandelion tastes crisp, the lactic acid bacteria are stored, and a health-care function of the lactic acid bacteria can be maintained after a person eats the fastfood dandelion; the directly fed lactic acid bacteria are used, and are convenient to use, the soybean oligosaccharides is added, growth of the lactic acid bacteria is facilitated, an intestinal function is improved, saprodontia and obesity can be prevented, and the fastfood dandelion tastes sour and sweet, and is safe and healthful; and moreover, the fastfood dandelion is convenient to carry and eat, time is saved, and requirements on fast pace of life are met.