The embodiment of the invention provides an organic light-emitting display panel and a display device thereof and relates to the technical field of display. The organic light-emitting display panel and the display device are used for reducing the width of a border of the organic light-emitting display panel. The organic light-emitting display panel comprises a first substrate, a second substrate and a packaging adhesive, wherein the first substrate comprises a display area and a packaging area around the display area; the second substrate is arranged opposite to the first substrate; the packaging adhesive is used for bonding the first substrate and the second substrate; an orthographic projection of the packaging adhesive on the first substrate is located in the orthographic projection ofthe packaging area on the first substrate; the first substrate also comprises a plurality of signal lines; the packaging area comprises a first area; and the orthogonal projection of at least one partof the signal lines on the first substrate is overlapped with the orthographic projection of at least one part of packaging adhesive on the first substrate in the first area. The organic light-emitting display panel is suitable for the display device.