In a speaker sound cavity structure of a mobile terminal of the present disclosure, the speaker sound cavity structure includes an antenna supporting member arranged on a mobile terminal. The antenna supporting member includes a sound-guiding groove configured as a transmission channel for transmitting sound in the speaker sound cavity structure of the mobile terminal. A lead-out hole is configured to lead the sound in a speaker sound cavity into a new speaker sound cavity of the mobile terminal. A lead-in hole is configured to guide the sound in the speaker sound cavity of into the new speaker sound cavity of the mobile terminal. The speaker sound cavity structure is configured to guide the sound of the speaker sound cavity to the new speaker sound cavity of the mobile terminal, so that the space in the speaker sound cavity of the mobile terminal is expanded.