The preparation process comprises extraction and purification of the sweetberry anthocyanin. The extraction step is as follows: firstly, drying and pulverizing the sweetberries, taking 1 part of the sweetberry by weight, adding 20 parts of ethanol acidified by hydrochloric acid to the sweetberries, extracting for three times, combining extracting solutions, rotarily evaporating and condensing, recovering the ethanol, and lyophilizing the concentrated solution in vacuum to obtain an extract product;

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