A method and device for adjusting a projected image are provided. In the method, a distance between a mobile terminal and a projection screen is acquired (S102); and at least one of a display area or a display orientation of a projected image on the projection screen is adjusted at least according to the distance between the mobile terminal and the projection screen (S104). Through the method and the device, a problem in a related art that the projected image can only be adjusted manually by a user is solved, and a viewing angle is adjusted to an optimal viewing angle for viewing a projected image in real time according to a distance with respect to a user, thereby protecting the eyesight of the user and improving user experience.