The present invention provides a display panel, a manufacturing method thereof and a display device. The display panel comprises a first substrate, a display component provided on the first substrate, and a packaging structure for packaging the display component on the first substrate, wherein the packaging structure includes at least two first water blocking layers and at least one planarization layer that are stacked alternately above the display component, each first water blocking layer includes a plurality of first areas and a plurality of second areas, and joint lines between the first areas and the second areas in any two first water blocking layers are staggered with each other.