The present disclosure provides a method for adjusting uniformity, a device for adjusting uniformity, an apparatus, and a computer readable storage medium. The method includes powering a spliced display device with different power supplying configurations within a first voltage range, acquiring brightness information of display areas of splicing components of the spliced display device under the power supplying configurations; calculating uniformities of the spliced display device under the power supplying configurations according to the brightness information, and determining the power supplying configuration corresponding to a maximum uniformity.