The energy absorption characteristics of foam-filled thin-walled columns subjected to oblique loads were analyzed with the finite element simulation technology. The influences of foam density, thickness, and aspect ratio of columns on the bending critical angle and average impact force were investigated. The formulation of the average impact force was developed in terms of design parameters and oblique impact angle. The results show that the critical angle of foam-filled columns is less than that of empty columns, and foam-filler density has a great influence on the critical angle. With the increase of cross section width from 70 mm to 90 mm, the critical angle of empty columns increases from 6° to 9°, while that of foam-filled columns does not change significantly. The critical angle of empty columns is not significantly influenced by the wall thickness, while higher wall thickness of foam-filled columns leads to larger critical angle. The average impact force is an exponential function of the impact angle, and is inversely proportional to the square aspect ratio and proportional to the exponential power of the wall thickness and density.