The present application provides a display method for a flexible display screen and a flexible display device, and belongs to the field of flexible display technology. The flexible display device includes: a flexible display screen; and a processor, configured to determine a deformation region of the flexible display screen and adjust display brightness of at least a portion of the deformation region to a first brightness, wherein the deformation region includes a transition region and an invalid region, the first brightness is less than a second brightness which is the display brightness of an non-deformation region.