The invention belongs to the technical field of reconstituted foods such as purple potato full powder nutritional porridge and discloses a purple potato full powder reconstituted product formula and apreparation method. A purple potato full powder reconstituted product is prepared from the following components in parts by weight: 100-300 parts of purple potato full powder, 30-100 parts of dehydrated vegetable particles and 54.37-166.85 parts of vegetable flavor seasoning. Production of staple food products in the field of the reconstituted foods such as purple potato instant porridge is realized; the purple potato full powder is mainly taken as raw materials, by adding a small quantity of the dehydrated vegetable particles, the taste is improved, nutrition is added, a small amount of sugar, salt, essence and the like are added for shallow saucing, and a finished product is good in reconstitution property, has the thick vegetable flavor and is exquisite, smooth, good in taste and freeof astringent sense and mushy watermelon pulp sense; by adopting the cold processing technology, the nutritional loss is less, the production efficiency is high, the utilization rate of the raw materials is high, and long-term preservation is facilitated; and the prepared finished product contains abundant dietary fiber, vitamins, minerals and the like, especially the content of anthocyanin is high, and the anti-oxidation function is high.