The invention discloses a fresh-keeping method of dried bean curd, and belongs to the field of foodstuff fresh-keeping technology. A dried bean curd raw material is carefully chosen; the dried bean curd raw material is washed with deionized water, the washed dried bean curd raw material and number one treatment fluid are mixed, stirring is carried out for a reaction, after filtering, the materialis transferred to a sterilizing chamber, disinfection treatment is carried out, and a pretreated dried bean curd raw material is obtained; the pretreated dried bean curd raw material and number two treatment fluid are mixed, immersion and filtering are carried out, in order to obtain dried bean curd with primary treatment; a sodium alginate mixture and water are mixed, calcium chloride is added, stirring is carried out for mixing, and number 3 treatment fluid is obtained; the dried bean curd with primary treatment and treatment fluid are mixed for immersion, filtering and drying are carried out, and fresh-keeping treatment of dried bean curd is completed. The dried bean curd has excellent fresh-keeping effects and prolonged refreshing time.