This study investigates the mechanical properties of a novel spider-web bionic hierarchical honeycomb under out-of-plane crushing. The authors introduce a self-similar spider-web hierarchical structure by adding smaller hexagons to the centers of the primitive cells in a regular hexagonal honeycomb (RH) and connecting the vertices of these smaller hexagons to the center points of the cell walls via straight beams. The hierarchical structure is designed to enhance the impact resistance and energy absorption capabilities of the honeycomb. Compression simulations validate the finite element model, and the out-of-plane crashworthiness of the bio-honeycomb is analyzed. The results show that the introduction of bionic cells and RH cell walls produces significant interaction effects, leading to more severe plastic deformation and the formation of folded flaps in the cell walls. The study also discusses the impact of geometric parameters on the crashworthiness of the novel biomimetic bio-honeycomb structures, finding that smaller bionic honeycomb pore sizes improve material utilization efficiency. This research provides valuable insights for the design of innovative hierarchical bio-honeycombs with enhanced energy absorption capacities.This study investigates the mechanical properties of a novel spider-web bionic hierarchical honeycomb under out-of-plane crushing. The authors introduce a self-similar spider-web hierarchical structure by adding smaller hexagons to the centers of the primitive cells in a regular hexagonal honeycomb (RH) and connecting the vertices of these smaller hexagons to the center points of the cell walls via straight beams. The hierarchical structure is designed to enhance the impact resistance and energy absorption capabilities of the honeycomb. Compression simulations validate the finite element model, and the out-of-plane crashworthiness of the bio-honeycomb is analyzed. The results show that the introduction of bionic cells and RH cell walls produces significant interaction effects, leading to more severe plastic deformation and the formation of folded flaps in the cell walls. The study also discusses the impact of geometric parameters on the crashworthiness of the novel biomimetic bio-honeycomb structures, finding that smaller bionic honeycomb pore sizes improve material utilization efficiency. This research provides valuable insights for the design of innovative hierarchical bio-honeycombs with enhanced energy absorption capacities.