The flesh of a purple potato is purple to dark purple. In addition to the nutrients of ordinary sweet potatoes, it is also rich in selenium and anthocyanins. Purple sweet potato is very popular in the international markets, and its development prospects are very broad. Purple sweet potato production season starts in September, supply time is limited, lasting only a few months. The whole purple sweet potato powder overcomes the production season restriction of purple sweet potato and greatly extends the production cycle of purple sweet potato food production enterprises.