The present disclosure discloses a method and a device for switching a display mode, relating to a mobile terminal field. The method includes: obtaining a first display mode of an operating system (101); and when the first display mode of the operating system is a night mode, switching a second display mode of an application to an application night mode (102). It is solved that operations are very complicated caused by that the user should manually activate the application night mode of each application in the night, and manually deactivate the application night mode of each application in the daytime when multiple applications are used, and it achieves an effect of automatically switching the second display mode of each application according to the first display mode of the operating system and simplifying user's operations.