The present disclosure provides an electromagnetic speaker, includes a frame having an elongated axis; a vibration unit accommodated in the frame, the vibration unit comprising a magnet assembly, the vibration unit further including a passage; a spring elastically deformable along the elongated axis and elastically suspending the magnet assembly in the frame; a guiding pole sleeved by the spring and at least partially passing through the passage for providing a guidance to the vibration unit; a voice coil fixed relative to the frame and surrounding the magnet assembly; a diaphragm driven by the vibration unit for radiating sounds. When the electromagnetic speaker is mounted in a mobile phone, the diaphragm vibrates along a direction parallel to the screen, and the amplitude thereof will not be affected by the height of the mobile phone.