Abstract: With the advent of the 5G era, the widespread use of various electronic devices has led to serious electromagnetic pollution problems. It is urgent to develop high-performance electromagnetic wave absorption materials to solve the above problems. In our work, nickel zinc ferrite (Ni_0.6Zn_0.4Fe₂O₄) nanoparticles were grown on reduced graphene oxide (rGO) sheets by a simple in situ growth method, and a series of Ni_0.6Zn_0.4Fe₂O₄/rGO (NZFO/rGO) absorbers were prepared by adjusting the dosage of rGO. The minimum reflection loss (RL) of NZFO/rGO-1:0.5 at 11.24 GHz is −60.72 dB with the matching thickness of 2.98 mm. In addition, when 5 wt% NZFO/rGO-1:0.5 composites were used to prepare the modified epoxy resin coating, the minimum RL value of the cement-based materials coated the coating is −42.2 dB, which is 90.95% lower than the minimum RL value of pure epoxy resin specimen; When the dosage is 3 wt%, the effective absorption bandwidth (EAB) value is 8.88 GHz, and the absorption bandwidth can reach 13.2 GHz when the RL value is less than −5 dB.