Taking the vertical wing wall of the intake of a nuclear power plant as the background, in this study, we used the FLAC^3D program to simulate the dynamic response of the vertical wing structure under earthquake action. Combined with the PL-Finn constitutive model, we studied the dynamic response law of the wing wall structure under dynamic load, and quantitatively evaluated the safety of the wing wall's revetment structure with respect to the structural displacement time history, structural deformation, excess pore water pressure ratio, and liquefaction area. The analysis results show that the structure experiences regular residual deformation due to the liquefaction-induced flow of sand, which increases with earthquake intensity. The horizontal and vertical deformations are caused by the earthquake inertial force and sand liquefaction. The horizontal residual deformation at the top of the wing wall structure under the action of SL1 was 0.05 m, and the vertical residual deformation was 0.07 m. Under the action of SL2, the horizontal residual deformation at the top of the wing wall structure was 0.26 m, and the vertical residual deformation was 0.16 m. Compared with the input ground motion of the bedrock, we found the horizontal and vertical accelerations at the top of the wing wall structure under the actions of SL2 and SL2 to be amplified by 4-5 orders of magnitude, whereby the closer the acceleration is to the top of the wing, the more significant is the amplification effect. The conclusions obtained in this paper can serve as reference for similar projects in the future.