The invention provides a preparation method of aroma components of cigarette. The method comprises the following steps: aspartic acid and sugar are subjected to a reaction under effect of a catalyst to obtain a reaction product; the catalyst is phosphate; the sugar is added in batches during a reaction process; and addition for every batch accounts for 10-80% of that of sugar gross weight. According to the method, the aspartic acid and the sugar are subjected to the reaction under effect of the catalyst to obtain the aroma components of cigarette; the sugar is added in batches during the preparation process, in the process, the sugar is continuously activated by the catalyst, the sugar and aspartic acid are catalyzed to form a maillard reaction product, dissolving for the aspartic acid can be promoted when the reaction is carried out, at the same time, sugar decomposition can be avoided, and finally the reaction product with high mass concentration can be obtained.