Purple sweet potato chocolate and preparation method thereof

The invention discloses a purple sweet potato chocolate and a preparation method thereof. The purple sweet potato chocolate is prepared from purple sweet potato flour, wheat flour and cane sugar according to a certain proportion. The preparation method comprises the steps: (1), preparing purple sweet potato flour; (2), mixing the purple sweet potato flour, the wheat flour and the cane sugar according to a certain proportion, adding water, stirring, conveying uniformly-stirred slurry in a rolling scratch board and drying to form thin sheets, and crushing the thin sheets into purple sweet potato crisp sheets through low-speed rotation; (3), heating to smelt cocoa butter; (4), pouring the purple sweet potato crisp sheets into the smelted cocoa butter, and mixing; (5), moulding the mixed slurry of the purple sweet potato chocolate product; (6), cooling and hardening; (7), separating the hardened purple sweet potato chocolate product from a mould; and (8), packaging the purple sweet potato chocolate. The purple sweet potato chocolate is beneficial to prevention of multiple diseases related to free radicals, such as cancers, heart disease, presenility and arthrophlogosis. The prepared purple sweet potato chocolate is purplish red in color, has two flavors of purple sweet potato and cocoa butter, and has the delicious crispness.