The work aims to investigate and discuss the high temperature oxidation of chemically active elements in magnetic metallic microwave absorbents (MMMA) and the resulting deterioration of electromagnetic properties in MMMA, to analyze the high temperature oxidation mechanism of MMMA and put forward corresponding strategies. Based on the process of oxygen adsorption, reaction and mass transfer in MMMA, the effect of high temperature oxidation on the electromagnetic properties was discussed. Three main strategies against high temperature oxidation in MMMA were proposed and reviewed, i.e., oxygen isolation from MMMA, formation of dense oxides on surface and suppression of oxygen diffusion. The strategy of oxygen isolation from MMMA has effectiveness in anti-oxidation by surface coating of organic polymers, inorganic compounds or magnetic metals. Among those coating materials, inorganic compounds are most promising, whereas the ultrathin dense coating of inorganic compounds is still challenge. The strategy for formation of dense oxides on surface have shown its potential in anti-oxidation for MMMA with selective oxidation of solute elements, forming protective film to effectively inhibit the oxidation process, but the introduction of high content of non-ferromagnetic solute elements is easy to reduce the magnetic permeability and deteriorate the microwave absorbing performance. The strategy for suppression of oxygen diffusion has been achieved by forming oxides in grain boundaries of MMMA to reduce diffusion paths of metal ions, active oxygen atoms and free electrons, while efficient methods to realize oxygen diffusion suppression are still absent. In view of the research of MMMA resistant to high temperature, it is necessary to consider the using temperature, type of matrix material, working frequency band and expecting absorption performance, thereby selecting appropriate anti-oxidant strategy.