Abstract: The high entropy absorbing materials of FeCoNiMn_0.5Al_0.2alloy were prepared by high energy ball milling method,and the influence regularity and mechanism of milling time on the absorbing property of FeCoNiMn_0.5Al_0.2alloy were studied. The results show that the diffraction peaks of five elements decrease gradually with the increase of milling time,resulting in the formation of FCC and BCC dual phase structure, and the aspect ratio of alloy particles increases gradually.With the increase of milling time, the solid solubility of non-ferromagnetic elements in ferromagnetic Fe and Ni increases, thus gradually reducing the saturation magnetization of the alloy. With the increase of ball milling time, the impurities and defects introduced by ball milling increase, resulting in the increase of coercivity, which reduces the anisotropy constant and magnetostriction coefficient, and improves the permeability and magnetic loss of the alloy. With the increase of milling time,the polarization effect increases and the conductivity decreases, which makes the dielectric constant decrease first and then increase. The best absorbing strength of FeCoNiMn_0.5Al_0.2alloy obtained by ball milling for 30 h is-38.181 dB.