The invention discloses a probiotic and prebiotic composition for forming lean body mass and application thereof, and relates to the field of biomedicine. The composition comprises probiotics such asbifidobacterium lactis, bifidobacterium longum, lactobacillus reuteri, lactobacillus rhamnosus, lactobacillus acidophilus, streptococcus thermophilus, bacillus coagulans and clostridium butyricum, anda prebiotic mixture is also added. By reasonably matching the components of the composition, the intestinal flora is effectively regulated, and the obesity is more efficiently and healthily relieved;for people with normal weight, the weight reduction effect is not obvious, but the body shape is more beautiful; meanwhile, the composition can effectively prevent hyperglycemia, hyperlipidemia and other diseases and improve the body immunity, is suitable for a wider range of people, and can be applied to food, pharmacy and healthy or natural product production.