Based on the improvement of ice resistance of offshore platform structure, a new type of concrete-filled double skin metal tubular jacket leg members is proposed. The method of theoretical analysis, test and simulation is used to study its impact resistance under lateral impact load. The outside tube materials of the members are respectively Q345 steel, grade 304 austenitic stainless steel and T6061 aluminum alloy. The single impact and continuous impact are adopted for the impact form. The time-history curve of impact load and time-history curve of mid-span deflection are recorded and compared with those of hollow pipe members. The results show that the impact resistance of combined members is better than that of hollow pipe members, and the overall impact resistance of aluminum alloy combined members is poor. The ultimate bearing energy of stainless steel under single impact is more than 18.83 kJ, and the number of bearing impact times under the continuous impact of small energy is the most, so the impact resistance of stainless steel combined members is the best. In addition, combined with the finite element ABAQUS software, the single impact members are modeled and the calculation results are basically consistent with the test results.