Rock fracture process, the electromagnetic radiation (EME) is set by the deformation and fracture of rock during the course of external radiation of electromagnetic energy, and rock deformation and fracture under load conditions and is closely related. On this basis, this paper designed a portable electromagnetic detection device of ore, the main LPC2132 processor hardware system, the electromagnetic wave detection module, the signal strength processing module, strength indication module and other components. Software system by the firmware, the signal transceiver module automatically constituted.