Abstract: The present disclosure discloses a method for synthesizing a diaza-bridged compound and a diaza-bridged compound, belonging to the field of organic synthesis. The present disclosure includes the following reaction: in the formula, R is aryl, substituted aryl, alkyl or haloalkyl, Ra is any one of H, 2-nitrobenzenesulfonyl, 4-nitrobenzenesulfonyl or 2,4-dinitrobenzenesulfonyl, n=1 or 2. Since compound 2 and NH3 are used as raw materials, the present disclosure can not only effectively shorten the process flow and save process costs, but also improve the reaction yield to a certain extent. The present disclosure also provides a diaza-bridged compound, where the structural formula thereof is in the formula, Ra is any one of 2-nitrobenzenesulfonyl, 4-nitrobenzenesulfonyl or 2,4-dinitrobenzenesulfonyl.