• Metasurface can significantly improve the EWAP of cementitious materials. • Integrated electromagnetic absorbing structures and materials method is designed. • MAPC-M exhibits a peak RL of −25.1 dB with a bandwidth of 11.64 GHz below −10 dB. • The effects of metasurface on the EWAP of MAPC are verified by CST simulation. Electromagnetic metasurface can effectively control the electromagnetic wave absorption performance (EWAP) of materials. This study presents an integrated structures and materials design method to improve the EWAP of cementitious materials. Based on a three-dimensional periodic array surface structure, nano-Fe 3 O 4 magnetic fluid is used as an absorber to develop metasurface cementitious electromagnetic absorbing materials. The experimental results show that the metasurface can effectively improve the EWAP of cementitious materials, achieving an excellent EWAP with a maximum reflection loss of −25.1 dB and a bandwidth of 11.64 GHz below −10 dB at 2–18 GHz. In addition, the CST simulation of the EWAP coincides with that obtained experimentally. In addition, the simulated electric and magnetic field distributions and magnetic loss density in the metasurface further demonstrate the synergistic effects of λ/4 resonance, edge diffraction, multiple reflection, and scattering on the dissipation of electromagnetic waves. Overall, these results indicate that electromagnetic metasurface can advance and promote the integrated design of materials and structures and the application of cementitious electromagnetic absorbing materials.