N-doped porous core-shell nanocomposite is considered to be a competent candidate for the absorbing of electromagnetic wave (EMW). In this work, polydopamine (PDA) wrapped ZIF-67 ([email protected]) precursors with the core-shell structure were obtained through ZIF-67 triggered dopamine self-polymerization. After high-temperature pyrolysis treatment, the N-doped graphitized carbon layers wrapped cobalt ([email protected]) absorber with porous structure was obtained, which exhibited high efficiency and adjustable EMW absorbing properties. The minimum reflection loss (RLmin) of [email protected] approached -59.08 dB at 17.7 GHz with a thickness of 1.7 mm. The effective absorption bandwidth (EAB) reached 5.8 GHz with a corresponding thickness of 2.3 mm. Besides, the RLmin of [email protected] reaches -44.07 dB at 14.5 GHz (thickness 2.0 mm), and the EAB is 5.9 GHz. Therefore, the porous core-shell [email protected] nanocomposite is expected to be a promising EMW absorption material.