The invention discloses radix puerariae meal replacement powder and a preparation method thereof. The radix puerariae meal replacement powder comprises the following raw materials in parts by weight of 30-40 parts of radix puerariae powder, 10-20 parts of konjac powder, 10-20 parts of Peruvian ginseng powder, 15-25 parts of soyabean protein powder, 5-10 parts of lotus leaf powder, 5-10 parts of whey protein powder, 1.5-3 parts of haw powder, 1-2 parts of oat flour, 0.4-1 part of yam flour, 0.4-1 part of a semen cassiae extract, 0.4-1 part of black sesame seed powder, 0.4-1 part of walnut powder and 0.4-1 part of sweet orange fine powder. The radix puerariae meal replacement powder is good in mouth feel, and low in calorie, has satiety sense, can complement energy and nutrients required byhuman bodies, can strengthen the fat metabolism and the enhancing immunity, and solves the difficult problem of being poor in nutrients caused by reducing weight. The radix puerariae meal replacementpowder has the characteristics of being high in fibers, low in calorie and low in fat, maintaining body energy, easily enabling people to have satiety sense, and being comprehensive in nutrients.