The invention provides a magnetic yoke used for a moving-iron microphone/transducer, which comprises an inner through hole, an enclosed soft magnet and two end surfaces orthogonal to the enclosed soft magnet. The magnetic yoke is one-piece configured, the outer peripheral surface of the soft magnet and the inner through hole respectively is used for connecting with an armature and a magnetic piece of the microphone/transducer, and one of the two end surfaces is used for connecting with an induction coil of the microphone/transducer, to form a vibrating/transducing drive mechanism. The manufacturing process of the magnetic yoke comprises forming a tube by drawing process and cutting the tube.