Based on the concept of functionally graded materials (FGM) and through changing the wall thickness of honeycombs cell, a model for density graded reentrant auxetic honeycombs is established by using the nonlinear finite element program LS-DYNA. The deformation modes, dynamic response and energy absorption characteristics of both the homogeneous and graded auxetic honeycombs under different in-plane impact velocities are examined and compared. Results indicate that the dynamic responses and energy absorption ability of graded auxetic honeycombs change with the gradient, cell re-entrant angle and impact velocity. Given proper parameters, the initial peak stress can be decreased, but the energy absorption ability is still kept well. Therefore, auxetic honeycombs with density gradient and negative Poisson′s ratio can be widely applied in structural protection areas.