The invention discloses a nutritional and health food with improved gastrointestinal functions and a preparation method thereof, which can adjust intestinal bacteria from various aspects such as increasing the type and quantity of probiotics, increasing the nutrients of probiotics, inhibiting the growth of harmful bacteria, and increasing human immunity. Group, improve gastrointestinal function. Using probiotic powders such as Lactobacillus plantarum as the main raw materials, scientifically compound edible fungus extracts and modified dietary fiber; Snow Lotus that can significantly improve human immunity, anti-inflammatory and analgesic, and has anti-oxidation, anti-radiation and anti-fatigue functions culture extracts, etc., while increasing the types of intestinal probiotic flora, it significantly enhanced the colonization ability and colonization time of endogenous and exogenous probiotics in the human intestinal tract, and effectively inhibited harmful intestinal bacteria, especially leather. The growth and reproduction of Lambert-negative bacteria fully regulate the composition of intestinal probiotic flora, and prepare a nutritional and health food with strong probiotic properties, significantly improving human immunity, and improving gastrointestinal function.