The invention relates to a high dietary fiber full nutrition special application formula food and a preparing method thereof, and belongs to the field of formula food. The high dietary fiber full nutrition special application formula food is prepared from, by weight, 0.7-2.1 parts of protein, 0.4-0.9 part of fat, 2.4-4.5 parts of carbohydrate and 0.3-0.7 part of dietary fiber. According to the high dietary fiber full nutrition special application formula food and the preparing method thereof, through screening and matching of raw and auxiliary materials, the food contains an appropriate amount of protein, carbohydrate and fat needed by people in daily life, and further contains mineral substances and vitamin needed by people, is in accordance to daily need by people, is easy to digest and absorb, can serve as a single nutrition source for people group over 10 years old whose eating is limited, can also serve as nutrition supplementation of a patient before and after a surgery, the product has a low GI value at the same time, contains rich dietary fiber, and is a good nutrient food for control sugar content and facilitating feces excretion.