A whole breast ultrasound image-capturing device comprises: a platform comprising an opening formed thereon; a mechanical driving system mounted in the opening and comprising a frame mounted on the mechanical driving system, a rotary module comprising a first gear, a second gear engaged with the first gear, and a drive motor connected to the first gear, and a radial movement drive comprising a translation mechanism radially movable; an array probe mounted in the radial movement drive; a holder connected to the translation mechanism to fix the array probe; a gel plate connected to a cam surface of the second gear through connecting frames, mounted on the holder, and comprising a plate opening enclosing the array probe to expose the array probe out of the gel plate; a film assembly mounted in the frame and comprising a film frame mounted in the frame and a film mounted in the film frame.