The present solution provides an earphone rear cavity structure, comprising an earphone casing having a rear cavity. The rear cavity is provided with a mounting position for placing a speaker (6); a speaker surface for transmitting a sound of the speaker (6) is provided at the mounting position; the speaker (6) is provided with a sound generation surface for making a sound, and the sound generation surface is provided opposite to the speaker surface; a connection member (10) is provided at the edge of an opening of the rear cavity; and a microphone is provided on the connection member (10). According to the present solution, by providing a mounting position in a rear cavity of an earphone casing (1), providing a speaker surface at the mounting position, providing a speaker (6) at the mounting position, configuring a sound generation surface to be opposite to the speaker surface, providing a connection member (10) at a rear cavity cover, and providing a microphone on the connection member (10), an independent speaker cavity is provided in the earphone casing, and the microphone is located in the speaker cavity, so that the earphones can be better noise-reduced, and the noise reduction effect is improved.
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