The invention provides a preparation method of recombined tobacco additive, comprising the following steps of 1, preparing radix valerianae extract; 2, uniformly mixing the radix valerianae extract prepared by the step 1 and other raw material components according to mass percentage: 4 to 8 percent of radix valerianae extract, 2 to 9 percent of plum extract, 2 to 6 percent of liquorice root reactant, 1 to 4 percent of coffee extract, 1 to 5 percent of 3 percent fenugreck lactone, 0.2 to 2 percent of phenethyl alcohol, 0.1 to 3 percent of 10 percent 2,3,5-trimethylpyrazine, 0.1 to 6 percent of 10 percent ethyl maltol, 0.1 to 4 percent of 10 percent methyl cyclopentenolone, 0.1 to 2 percent of 10 percent vanillin, 0.1 to 2 percent of 10 percent acetylfuran, 5 to 15 percent of fructose, 5 to 20 percent of propylene glycol and 6 to 77.3 percent of water. The additive provided by the invention can effectively mask various foreign flavors of recombined tobacco, and improve the own fragrance of the tobacco, so as to improve the sensory quality and availability of the recombined tobacco.