The invention discloses a method for preparing oligopeptide of snake meat, which comprises the following steps of: selecting a healthy and live adult snake from zaocys dhumnade, hagworm, gloydius saxatilis, dinodon rufozonatum, cobra, coral snakes, agkistrodon acutus, elaphe schrenckii, elaphe anomala, enhydris chinensis, and the like, slaughtering, removing the head, tail, skin and viscera of the snake, cleaning a carcass part with clear water, and performing processes such as grinding, jordaning, enzymolysis, filtration, enzyme deactivating, salt and arsenic removal, nanofiltration and concentration, spray drying and the like to obtain dry oligopeptide powder of the snake meat. The obtained product has the molecular weight of over 85 percent and the molecular weight distribution of 200-5,000Dalt; and bioactive substances have the effects of resisting tumors, coagulation, oxidation and fatigue, improving immunity, preventing heart cerebrovascular disease, preventing and treating rheumatic arthritis and the like.