The invention relates to the field of daily chemicals and medicine industry, specifically to 1, 2, 3-triazole starch derivatives, and a preparation method and application thereof. The 1, 2, 3-triazole starch derivatives have a structural formula as shown in a formula (1), wherein R is a chain-length-equivalent substituted group containing different active groups; and a value range of an average polymerization degree n is 5 to 12000. According to the invention, reaction is highly efficient; popularization is easy; and needed equipment and raw materials are easily available. Research results show that the synthesized 1, 2, 3-triazole starch derivatives have good water solubility and excellent antibacterial activity, strengthen biological activity of starch, expand the application range of the starch, and can be extensively applied in the fields of daily chemicals and medicines.
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