Abstract: The sound absorption structure of tube bundle perforated panel has the ability of low-frequency tuning. However, its large mass limits its application in rockets that has an extremely high requirement for launch efficiency. Therefore, a lightweight sound absorption structure of tube bundle perforated panel was proposed based on its conventional structure. Two structural units with complementary sound absorption frequency bands were designed. The sound absorption and the sound insulation tests were carried out. The results show that the sound absorption coefficient of the lightweight sound absorption structure of tube bundle perforated panel is above 0.5 in the frequency band of 100-500 Hz, and the sound insulation increase 5.1 dB. In addition, the density of lightweight sound absorption structure of tube bundle perforated panel is only 18 kg/m³, which is 80% less than the conventional ones.