The present invention relates to a method for synthesizing carbamate by using an olefin, an amine, carbon dioxide and a Togni reagent. The method comprises: in a high pressure reaction kettle, sequentially adding an organic solvent, an olefin, an amine and a Togni reagent, adding a copper salt as a catalyst, introducing carbon dioxide, carrying out a stirring reaction for 5-24 h at a temperature of 40-100 DEG C, cooling to a room temperature after completing the reaction, slowly releasing carbon dioxide to achieve an atmospheric pressure, carrying out water washing on the reaction solution, extracting with ethyl acetate, drying with anhydrous magnesium sulfate, carrying out pressure reducing distillation concentration to obtain a crude product, and carrying out column chromatography purification to obtain the carbamate compound. According to the present invention, the synthesis method avoids the use of toxic raw materials such as phosgene or isocyanate, and the like, has characteristics of safe and simple operation, mild reaction condition, good functional group compatibility, wide substrate applicability and high yield, is suitable for industrial production, and has good application prospects in synthesis of pesticides, medicine, and natural products.