Provided are a method and device for adjusting a call volume and a mobile terminal, wherein the method includes detecting gravity location information of a terminal when a given detection time is reached, and adjusting a current call volume in accordance with a given volume adjustment rule when the gravity location information and gravity location information obtained by last detection are separately located on two sides of a pre-set gravity zero line. The application of the present disclosure solves a problem in the related art that a user in a call using a left ear and a right ear alternatively usually needs to continuously adjust volume of an earphone manually because there is a hearing difference between the left ear and the right ear, which results in much inconvenience when answering a call, and thus the call volume during a call can be automatically adjusted, a performance of the mobile terminal is enhanced and user experience is improved.