To improve the in-plane impact resistance of trichiral structures, a re-entrant trichiral structure (RTH) was constructed by adding re-entrant structure into trichiral honeycomb (TH). The deformation modes, energy-absorbing capacity, and auxetic performances of RTH under different impact velocities were studied by using the commercial software LS-dyna. Furthermore, based on the concept of the energy absorption efficiency method, the plateau strain εp of the RTH can be determined. The results show that re-entrant structure can enhance the localized "necking" deformation of TH under medium- and low-velocity impact, and a "\" -shape deformation mode appears during the entire collapse process. Furthermore, it is found that the stress-strain curves can be divided into two stages: the plateau region and stress increasing region. The plateau strain εp and densification strain εd are gradually increased with crushing velocity. Compared with the TH, the RTH has better energy absorption capacity and auxetic performances, especially under medium- and low-velocity crushing modes. In detail, the specific energy absorption of RTH is 61.16% higher than that of TH under low-velocity impact and 58.9% higher under medium-velocity impact. This study is expected to provide a novel path for the design of hybrid deformation mechanism auxetic honeycombs.

CICTP