The electromagnetic wave absorbers widely applied to various harsh scenes, especially with anti-corrosion properties have been reported and the focus was at the anti-inorganic corrosion. However, the organic corrosion, such as microbiologically influenced corrosion is also serious and needs to be overcome. Herein, based on the excellent electromagnetic synergy effect, a series of cobalt-based metal-organic framework-derived composites with hollow bowl-shape were synthesized. By modulating the balance between the dielectric and magnetic loss, the minimum reflection loss of − 52.66 dB with matching thickness of 2.7 mm and an ultra-wide effective absorption bandwidth of 6.8 GHz, which covered the whole Ku band, with a thickness of 2.4 mm, were achieved. In addition, the radar cross section values of the composites were simulated and the results verify the excellent absorption performances of the absorbers. Combining the prominent absorption performance, the derived composites exhibited exceptional anti-microbiologically influenced corrosion properties reflected by the electrochemical impedance modulus at 0.01 Hz substantially increasing more than 3 times. Until now, no similar bifunctional materials have been reported, so it is of great significance and emergence to fill this gap, we hope our work can provide a theoretical basis for the following related experimental research.