Abstract: The low frequency radar-stealth performance of the dielectric metamaterial for broadband wave-absorbing honeycomb sandwich composites was studied. The electromagnetic response characteristics of the carbon fiber dielectric metamaterial units and their effects on the electrical and mechanical properties of wave-absorbing honeycomb sandwich composites were analyzed. The results show that the electromagnetic response of the carbon fiber metamaterial units can be comparable to that of the metal metamaterial units. When the height of the wave-absorbing honeycomb is 50 mm and the thickness of the wave-transmitting skin is 1 mm, the introduction of the carbon fiber metamaterial units can significantly improve the low-frequency wave-absorbing performance of the honeycomb sandwich composites. The weakest reflectivity and the averaged reflectivity in the L-band are increased by more than 2 dB and 4 dB, respectively. The mechanical properties of the wave-transmitting skin with carbon fiber dielectric metamaterial are close to that without metamaterial units. The introduction of carbon fiber dielectric metamaterial units shows no negative effects on the mechanical properties of the wave-transmitting skin.