The aim of this work was to study the in-plane dynamic impact behavior of double-walled aluminum honeycombs. The finite element model of double-walled aluminum honeycombs was established by Ansys/LS-DYNA. The influences of honeycomb cell wall thickness and impact velocity on the deformation mode and the plateau stress were analyzed. Three deformation modes were observed in the compressed direction with the increasing impact velocities. The transition velocities of deformation modes were obtained and the formula between critical velocities and height-to-width ratios were suggested. The dynamic plateau stresses of aluminum honeycombs were calculated with different height-to-width ratios at different impact velocities. The deformation mode had a great influence on the plateau stress which presented different variations at different deformation modes. In quasi-static mode, the plateau stresses had nothing to do with impact velocities. However, in transition mode and dynamic mode, the plateau stresses increased linearly with increasing v1.5 and v2, respectively. The empirical formulas between plateau stress and impact velocity were given at different deformation modes according to the finite element simulation results.