Method and device for adjusting sound volume and earphone

The embodiment of the application provides a method and device for adjusting sound volume and an earphone. The method for adjusting sound volume provided by the application comprises the following steps: obtaining an environmental noise signal outside the earphone, primarily adjusting the sound volume of the earphone according to the environmental noise signal in order to acquire the sound volumematching the external environment; and acquiring a current head movement signal of a user generated by head movement of the user, secondarily adjusting the sound volume of the earphone subjected to primary adjustment according to the current head movement of the user in order to acquire the sound volume meeting the demand for the user. The method for adjusting the sound volume provided by the embodiment of application can quickly and accurately adjust the sound volume through the mode of integrating primary coarse adjustment with secondary fine adjustment. There is no need for the user to manually operate so that the