Abstract: An energy saving electromagnet with momentary demagnetization of this invention comprises an armature, an iron core, an exciting coil, and a controllable power source. It is provided with an energy storage means capable of generating a momentary rotation force to cause the armature to rotate slightly for momentary demagnetization after the power source is cut off. The controllable power source includes an initiation power source, a holding power source and a control circuit for turning the supply from the initiation source to the holding source, thereby enabling effective utilization of the electric power and reduction of magnetic resistance. In the holding state, there is no significant demagnetizing air gap between the armature and the iron core.