The invention discloses a nitrogen-containing heterocyclic phenyl piperidine compound or pharmaceutical salt thereof. The general structural formula a of the compound is as shown in specification, wherein R represents hydrogen, mono-substituted or poly-substituted halogen, methyl, methoxyl, tertiary butyl or trifluoromethyl; and R2 is hydrogen, chlorine, bromine, methyl or ethyl. The compound disclosed by the invention is novel in structure; and by introducing the active amino in the form of a piperidine ring, the configuration of the side-chain amino is reinforced and the rigidity of the compound is enhanced. Through the design transformation, the Akt1 kinase inhibitory activity and the PC-3 cell line growth inhibitory activity of the compound are significantly enhanced.