The invention provides purple sweet potato bread and a making process thereof. The purple sweet potato bread is prepared from main flour, auxiliary material and water. The main flour contains purple sweet potato flour and wheat flour, wherein the purple sweet potato flour accounts for, by weight, 20-30% of the main flour. The auxiliary material includes white granulated sugar, milk powder, eggs, waterless butter oil, yeast, a bread improver and salt; based on the total amount of the main flour, the white granulated sugar accounts for 15-40% by weight, the milk power 8-16%, the eggs 8-16%, the waterless butter oil 8-16%, the yeast 3-6%, the bread improver 0.4-1%, the salt 0.6-1.2%, and water 50-80%. During making, two-time proofing is adopted, so that all the ingredients in the purple sweet potato flour and the wheat flour are fully mixed; then bread baking is performed and obtained bread has better taste of purple sweet potatoes; if people often eat the purple sweet potato bread provided by the invention, the purple sweet potato bread can achieve an excellent health care and nursing effect on the bodies and is beneficial to the health of the people.