An external speaker assembly and an audio apparatus are disclosed. The external speaker assembly comprises a housing, a speaker unit and a driving circuit; the external speaker assembly is detachably connected to an audio device; when the external speaker assembly is connected to the audio device, a sealed cavity is formed by the housing and a rear cover of the audio device; the speaker unit and the driving circuit are received in the sealed cavity; the driving circuit is configured to connect to the audio device, and receive an audio signal from the audio device to drive the speaker unit to produce sounds.