The invention relates to an energy-saving LED street lamp. The energy-saving LED street lamp comprises a shell body, a chip and a driving plate. Permanent magnet plates are installed on the lower surface of a top plate of the shell body and the upper surface of a bottom plate of the shell body correspondingly. Magnetic pillars are equidistantly and uniformly distributed in the circumferential direction of the driving plate. A ratchet wheel bearing is installed in the center of the driving plate. An outer ring of the ratchet wheel bearing is fixedly connected with the driving plate. An inner ring of the ratchet wheel bearing can unidirectionally and independently rotate relative to the outer ring. A driving rod is further installed on the axis of the inner ring. A resetting device is installed at the lower end of the driving rod. An excitation wire is installed between the driving plate and the top plate. The excitation wire and the chip are electrically connected and form a closed loop. The energy-saving LED street lamp is capable of operating independently, high in safety and stability, simple in structure, low in cost, convenient to install and has great popularization advantages.