The invention provides a synthetic method for 2,4,6-trimethylbenzene-1,3,5-triamine and an N,N,N-triacylated product. The method comprises the following steps: S1, performing a nitration reaction on mesitylene with structural formula IV as a reaction raw material in the presence of a mixed acid of fuming nitric acid and concentrated sulfuric acid, and after the nitration reaction, performing filtration and drying to obtain 1,3,5-trimethyl-2,4,6-trinitryl benzene with structural formula III; S2, performing a hydrogenation reaction on 1,3,5-trimethyl-2,4,6-trinitryl benzene and a reducer hydrazine hydrate to reduce nitryl to amino, and performing purification to obtain 2,4,6-trimethylbenzene-1,3,5-triamine with structure formula II; and S3, performing an acylation reaction on 2,4,6-trimethylbenzene-1,3,5-triamine and an acylation reagent to obtain N,N,N-triacyl-2,4,6-trimethylbenzene-1,3,5-triamine with structural formula I.