Single-phase bulk high-entropy spinel ceramics of (Mg0.2Co0.2Ni0.2Cu0.2Zn0.2)Fe2O4 were prepared via solid-phase reaction. The phase composition, microstructure and element distribution were analyzed by X-ray diffraction, scanning electron microscopy and energy dispersive spectroscopy. The volume density of the ceramics increases and the porosity decreases with the increase of sintering temperature. The dense high-entropy spinel ceramic sintered at 1 200 ℃ presents a single-phase, uniform distribution of elements, and its bending strength and fracture toughness reach 43.00 MPa and 1.30 MPa·m1/2, respectively. The high-entropy spinel ceramic as a good load bearable broadband microwave absorbing ceramic has dielectric loss and magnetic loss to electromagnetic wave, and the maximum effective absorption bandwidth (EAB=12.37 GHz) maxi can be obtained at 3.0 mm.