The invention belongs to the technical field of food processing, and particularly relates to a purple basic material for healthy food, a preparation method and application to bakery foods. The purple basic material for the healthy food is prepared mainly by mixing mulberry residue submicron powder, purple potato powder and purple yam powder according to a proper proportion and combining advanced technologies such as low-temperature gradient heat pump drying and submicron crushing, and is unique in taste and resistant to high-temperature baking. The prepared purple basic material for the healthy food contains a plurality of nutritional components, tastes sour and sweet, can be added into fillings and pie crusts of the bakery foods, and has the characteristics of dyeing function, taste modification function, high nutritional value and the like.