Abstract: The characteristic laws of electromagnetic radiation variation for coal rock during its loaded failure process under cyclic loading conditions are studied in this paper, and the its mechanism is analyzed too. The results show that the parameters change of coal rock electromagnetic radiation signal substantially increases linearly with increasing cyclic loading during uniaxial cyclic loading; the electromagnetic radiation signal parameters increases as the load increases and becomes gradually smaller in the unloading process, the reason for this phenomenon is the evolution of microcracks and the mutual friction in coal matrix during coal rock loading process.