The invention discloses purple-potato wholewheat-flour bread and a production method thereof. The purpose-potato wholewheat-flour bread is produced by raw materials including, by weight, 1000g of high-protein flour, 80-100g of all-powdered purple potato, 600-650g of water, 100-150g of white sugar, 10-15g of salt, 100g of eggs, 50g of milk powder, 20-30g of vegetable oil, 15-20g of instant dry yeast and 5g of bread improvers. The production method includes pretreatment of the raw materials, dough blending and fermentation (powder blending the first time, fermenting the first time, powder blending the second time and fermenting the second time), shaping (dough dividing, weighing, dough kneading, intermediate waking up, shaping, dishing up and forming), coloring, baking, cooling, packaging and obtaining finished products. In the method, wheat flour is taken as the main raw material, the all-powdered purple potato is added during production, and attractive color and luster are endowed to the bread, the traditional fast food; multiple physiological active substances are added during the production, so that the purple-potato wholewheat-flour bread is enabled to be the healthcare bread which is more appetitive and rich in nutrition.