A foldable display module is provided. The foldable display module includes a folded region and non-folded regions located on two sides of the folded region, and a flexible display panel and a flexible support layer disposed on a rear portion of the flexible display panel. A thickness of the flexible support layer ranges from 150 micrometers to 1000 micrometers, and a thickness of the flexible support layer corresponding to the folded region is less than a thickness of the flexible support layer corresponding to the non-folded regions. The present invention effectively reduces material and manufacturing costs of current foldable devices by thinning a portion of the flexible support layer corresponding to the folded region.