Abstract: A micro-speaker is disclosed. The micro-speaker includes a frame defining a hollow space, a diaphragm attached to the frame, a voice coil positioned on the diaphragm, a cover covering the diaphragm and attached to the frame forming a housing, a yoke received in the hollow space and attached to the frame, a magnet received in the yoke, and a pole plate attached on the magnet. The yoke includes a bottom wall, and two ends of the base wall are provided with a groove corresponding to the magnetic gap, respectively. A width of the groove is greater than that of the thickness of the voice coil.