Provided is a movable coil structure, comprising a vibrating diaphragm, and a permanent magnet, a voice coil and copper rings, which are arranged below the vibrating diaphragm, wherein the permanent magnet generates a magnetic field to suspend the vibrating diaphragm; the center, the middle and the periphery of the vibrating diaphragm are respectively fixedly connected to a first copper ring, the voice coil and a second copper ring; the voice coil generates vibration under the action of different audio signal currents; and the vibration of the voice coil and the magnetic field together drive the movement of the vibrating diaphragm to generate sound waves. The provision of the first copper ring can fix the vibrating diaphragm, prevent the vibrating diagram from randomly shaking, and increase a low-frequency band region, and at the low-frequency band, after superposition, sound saturation is high, and the earphone sound quality is good.
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