This application provides a theme wallpaper generation method and an electronic device. The electronic device may be a mobile phone, a tablet, or the like. A user may set any picture as a theme wallpaper of the mobile phone based on a preference and a requirement of the user. In the method, an effect of dynamic linkage in a process of switching from an always on display screen to a lock screen interface and then to an unlock interface is presented to the user based on an image processing process customized by the user, such as detection and identification of the picture and image cropping of a target element in the picture, and different transition modes and transition animations that are set by the user and that are corresponding to the process of switching from the always on display screen to the lock screen interface and then to the unlock interface of the mobile phone, to provide smooth visual experience to the user.