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Carbon fiber (CF) is a significant multifunction material, which is extensively used in aircraft because of its superb performance. However, its microwave absorption properties (MAPs) are seriously restricted as a result of the impedance mismatch issue. To address this issue, an efficient strategy is conducted by a series of CF@MoS 2 and CF@MoS 2 @Fe 3 O 4 composites that are fabricated by in-situ grown MoS 2 nanosheets (MoS 2 -NS) and Fe 3 O 4 nanoparticles (Fe 3 O 4 -NPs) on the surface of CF. The results of microwave absorption performance (MAP) reveal that the minimum reflection loss (RL) can reach −21.4 dB with a CF@MoS 2 composite coating thickness of 3.8 mm; the effective attenuation bandwidth (RL < −10 dB, i.e. , 90% microwave energy is attenuated) is up to 10.85 GHz (7.15–18.0 GHz). From a detailed analysis, it is observed impedance mismatch is the critical limiting factor for MAPs rather than attenuation. Furthermore, for CF@MoS 2 @Fe 3 O 4 , the MAP is strongly dependent on the level of coating of magnetic Fe 3 O 4 -NPs on the surface of CF@MoS 2 composites. The mechanisms underlying the superb MAP and related phenomena are investigated, opening new directions for fabricating CF-based microwave absorbers with high efficiency and wide-bandwidth. Finally, the occurrence of multi-reflection phenomena of EM waves in absorbers are critically analyzed. [ABSTRACT FROM AUTHOR]