The invention discloses a display panel, a manufacturing method thereof and a display device. Due to the fact that tension of frame sealing glue on any two opposite edges of the display panel is gradually reduced or increased from the middle to the two ends in the coating extending direction of the frame sealing glue, the display panel has a curvature. Compared with the display panel with the curvature formed in the modes such as a resin substrate mode or a thin film pasting mode the prior art, the technology process of the display panel is easy and convenient, and the manufacturing cost is reduced.