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Taking full advantage of interface engineering to strengthen interface polarization is an effective strategy to improve microwave absorption. Therefore, constructing the mixed-dimensional heterostructures and/or three-dimensional (3D) interconnected network structures should be attractive pathways to create the abundant interfaces for enhanced interfacial effect. Herein, mixed-dimensional framework structure carbon foam (CF)/carbon nanotubes (CNTs)@Fe 3 C@Fe 3 O 4 samples consisting of 3D CF, one-dimensional (1D) CNTs and zero-dimensional (0D) Fe 3 C@Fe 3 O 4 nanoparticles were elaborately designed and produced through a simple catalytic chemical vapor deposition process. The as-prepared CF/CNTs@Fe 3 C@Fe 3 O 4 heterostructures with the different contents of CNTs could be selectively produced by regulating the pyrolysis time. Owing to the unique structure and excellent synergistic effects, the obtained mixed-dimensional CF/CNTs@Fe 3 C@Fe 3 O 4 samples presented the excellent comprehensive electromagnetic wave absorption performances (EMWAPs) including strong absorption capabilities, broad absorption bandwidths, thin matching thicknesses and low densities. Furthermore, the obtained results demonstrated that the enhanced content of CNTs greatly boosted their conduction and polarization loss abilities, which resulted in the enhanced comprehensive EMWAPs. Therefore, our findings not only offered a simple strategy to produce the mixed-dimensional framework structure magnetic CF/CNTs-based heterostructures as excellent lightweight high-efficiency microwave absorbers, but also provided an effective pathway to make the best of interface engineering for enhancing interface polarization. Constructing mixed-dimensional lightweight flexible CF/CNTs@Fe 3 C@Fe 3 O 4 heterostructures: an effective strategy to achieve tunable and boosted microwave absorption. [Display omitted] • Mixed-dimensional framework structure CF/CNTs@Fe 3 C@Fe 3 O 4 heterostructures were produced through a simple process. • The CF/CNTs@Fe 3 C@Fe 3 O 4 with different contents of CNTs were produced by regulating the pyrolysis time. • The enhanced content of CNTs greatly boosted their conduction and polarization loss abilities. • Owing to the abundant interfaces, the designed CF/CNTs@Fe 3 C@Fe 3 O 4 presented the excellent EMWAPs. • Our findings provided an effective pathway to make the best of interface engineering for enhanced interface polarization. [ABSTRACT FROM AUTHOR]