Yarn breaking detecting device and method without external power supply

The invention discloses a yarn breaking detecting device and method without an external power supply, and belongs to the technical field of textiles. A steel wire ring is always in a high-speed rotating state when in a normal operating state, so that the steel wire ring is magnetized through magnetizing bodies, power is obtained through magnetic lines generated during the movement by cutting the magnetized steel wire ring through an electronic tag to send signals; once yarn is subjected to a yarn breaking phenomenon, the steel wire ring cannot obtain the power by cutting the magnetic lines, that is, the signals cannot be sent, and a reader cannot read the signals, so that the position where the broken yarn is can be determined. The yarn breaking detecting device does not the external powersupply, the problem of messy wiring caused by an eddy sensing device and a photoelectric detection device is solved, each magnetizing body and the electronic tag operate independently and do not affect each other, and the st