The invention relates to a preparation method and an application of full-nutrient bamboo shoot powder with high dietary fibers, and belongs to the technical field of the modern food processing. The method is characterized in that bamboo shoots are selected as raw materials, and the raw materials are washed, shelled, re-washed, roughly cut, homogenized, frozen, thawed, dried, ground, screened, and packed to obtain the full-nutrient bamboo shoot powder with the high dietary fibers. The full-nutrient bamboo shoot powder is not only rich in soluble and insoluble dietary fibers, but also rich in amino acid varieties, high in protein, low in fat, rich in vitamins, minerals and trace elements, full in nutritional value, wide in application range, convenient and easy to use and balanced in nutrients and has the special faint scent of bamboo shoots, the nutritional health-care function and special flavor substance of the bamboo shoots can be maximally played; the full-nutrient bamboo shoot powder is added in milk tea powder, baby formula milk powder, milk powder for seniors, diet food for women, bread, cakes and other wheat food.