This application discloses a gradation adjustment method and an electronic device, and relates to the field of display technologies. The method includes: displaying a first window of a first application at a first moment, where a gradation of the electronic device at the first moment is a first gradation; and displaying a second window of a second application at a second moment in response to a first window switching operation input by a user, where the gradation of the electronic device changes to a second gradation after the second window is displayed, and the second gradation is lower than the first gradation. The gradation of the electronic device changes to the first gradation at a third moment that is first duration after the second moment.