Disclosed is a dustproof mobile phone earphone hole. The dustproof mobile phone earphone hole comprises an inserting hole body whose inner side wall is provided with an earphone contact, and a dustproof assembly. The dustproof assembly comprises a dustproof plug arranged at the opening of the inserting hole body, an arc projection arranged at one side of the dustproof plug and a return spring installed on the arc projection. The inlet of the inserting hole body is provided with a gap corresponding to the arc projection in terms of shape. The two ends of the return spring are fixed at the two ends of the gap. The opening segment of the inserting hole body is also provided with an accommodation cavity for accommodating the dustproof pug. The dustproof mobile phone earphone hole has the following advantages: the structure is simple, the manufacturing cost is low, dust can be prevented from penetrating into an earphone hole without manual operation, and the user experience is improved.