Energy-saving control system and method for LED illuminating lamp

The invention discloses an energy-saving control system and method for an LED illuminating lamp, and relates to the technical field of illuminating systems. The system comprises a lane illuminating lamp, a microprocessor A, a microprocessor B, a geomagnetic sensor and a control unit, wherein the geomagnetic sensor is used for detecting whether a vehicle passes through a lane of a motor vehicle; the sensors are respectively arranged on all lanes at two ends of each one-way driving road section and output collected electric signals to the microprocessor A; the control unit is used for outputting a turn-on instruction to the microprocessor B at the intersection connected with the position corresponding to the microprocessor A when the microprocessor A controls the lane illuminating lamp A to be in a turn-on state, and then the microprocessor B controls the lane illuminating lamp B to be in a turn-on state; on the contrary, the lane illuminating lamp B is in an off state. Through the action of the geomagnetic sen