The invention discloses an LED driving circuit, for solving the problems of quite low conversion efficiency, quite low reliability and quite high cost universally existing in a conventional circuit of the same kind. The LED driving circuit employs a special circuit design of single-transistor self-excited oscillation and output of a regenerative feedback loop composed of a magnet ring coil, such that the conversion efficiency and reliability of the circuit are remarkably improved, the cost of the LED driving circuit is substantially reduced, and the LED driving circuit can be widely used as a driving circuit of various LED illumination systems.