The invention discloses an automobile energy-absorbing box based on periodic honeycomb structure inner core. The automobile energy-absorbing box based on the periodic honeycomb structure inner core comprises a mounting plate (1), a rectangular cross-section thin-walled energy-absorbing box body (2) with a rectangular cross-section and the periodic honeycomb structure inner core (3); the periodic honeycomb structure inner core (3) is sleeved within the energy-absorbing box body (2); one end of the energy-absorbing box body (2) is fixedly connected with the mounting plate (1); and the periodic honeycomb structure inner core (3) consists of a plurality of unit cells (31) which continuously extend along a three-dimensional space. The automobile energy-absorbing box based on the periodic honeycomb structure inner core has the advantages of large energy absorbing density, high energy absorbing stability and good parameter adaptability.