The invention discloses weight-losing probiotic tablets and a preparation method thereof. According to the weight-losing probiotic tablets and the preparation method thereof, probiotic powder such as lactobacillus plantarum is taken as a main raw material, and modified dietary fibres, fruit and vegetable powder, oligosaccharides, plant extract, protein powder, tea leaf extract, Chinese herb extracts and the like are scientifically compounded, thus increasing the content of soluble celluloses with real significance in probiotic groups, and enhancing the physiological activity of the celluloses, and then remarkably improving the planting capacity and the planting time of endogenous and exogenous probiotics in human intestinal tracts, effectively suppressing the growth and the reproduction of intestinal harmful bacteria, in particular, Gram negative bacteria, and adequately regulating the composition of the intestinal probiotic groups while increasing the types of the intestinal probiotic groups; the prepared weight-losing probiotic tablets are high in bioactivity, long in planting time in the human intestinal tracts, remarkable in weight-losing effect, and wide in the range of appropriate crowds.