The invention discloses a bifunctional 4-TMS-5-I-1,2,3-triazole compound as well as a preparation method and application thereof. According to the technical scheme, the bifunctional 4-TMS-5-I-1,2,3-triazole compound is characterized by being prepared at normal temperature, wherein trimethyl silyl acetylene and nitrine serve as raw materials, acetonitrile serves as a solvent, cuprous iodide serves as a catalyst, N-chlorosuccinimide serve as an oxidant, and N-di(isopropyl)ethylamine serves as an alkali. The bifunctional 4-TMS-5-I-1,2,3-triazole compound has a structural formula as shown in the specification, wherein R is as shown in the specification. The invention further discloses a preparation method of the bifunctional 4-TMS-5-I-1,2,3-triazole compound and a method of further synthesizing a 1,5-di-substituted-1,2,3-triazole compound from the bifunctional 4-TMS-5-I-1,2,3-triazole compound which serves as an intermediate. The raw materials are wide in source, are easy to prepare and are low in cost, and the cuprous iodide adopted by reaction serves as the catalyst and the reactant, is very low in cost, is simple and is easy to obtain.