The embodiment of the invention provides an acoustic device and electronic equipment, the acoustic device comprises a first closed cavity and a second closed cavity, a spacing part can be at least partially and flexibly deformed, the first closed cavity is adjacent to a vibrating diaphragm, and the second closed cavity is far away from the vibrating diaphragm; When the vibrating diaphragm vibrates, the internal sound pressure of the first closed cavity is changed, the flexible deformation part is deformed along with the change of the sound pressure in the first closed cavity, and the volume ofthe first closed cavity is flexibly adjusted; The second sealed cavity seals sound waves generated when the flexible deformation part deforms in the second sealed cavity, and the flexible deformationpart is of a single-layer structure made of a thermoplastic elastomer material layer or a multi-layer composite structure at least compounded with a thermoplastic elastomer material layer. Therefore,the acoustic device provided by the invention can increase the sound capacitance of the flexible deformation part, thereby reducing the resonant frequency of the sound production device and effectively improving the low-frequency effect of the sound production device.