The invention discloses a nutritional 
health food with the function of improving 
gastrointestinal function and a preparation method thereof. The nutritional 
health food can be used for regulating the intestinal 
flora to improve the 
gastrointestinal function from the aspects of increasing the probiotics type and quantity, increasing the probiotics 
nutrient substance, inhibiting the growth of harmful 
bacteria and enhancing the 
immunity of 
human body. According to the preparation method, probiotics 
powder such as 
lactobacillus plantarum is used as the main 
raw material, and edible fungi extracts and modified dietary fibers are scientifically compounded; 
saussurea involucrata culture extracts which are capable of remarkably enhancing the 
immunity of 
human body, resisting inflammatory and easing pain, and have the functions of 
oxidation resistance, 
radiation resistance and 
fatigue resistance are used, so that while the intestinal probiotics 
flora types is increased, the fix planting capacity of the endogenous probiotics and exogenous probiotics in the intestinal tracts of 
human body is remarkably enhanced, and fix planting time of the endogenous probiotics and exogenous probiotics in the intestinal tracts of human body is prolonged remarkably, the growth and 
reproduction of the harmful 
bacteria, particularly the 
Gram negative 
bacteria, in the intestinal tracts are effectively inhibited, the forming of the 
probiotic floras in the intestinal tracts is fully regulated and the nutritional 
health food which is good in 
probiotic property, capable of remarkably enhancing the 
immunity of human body and has the effect of improving the 
gastrointestinal function is prepared.