A display panel and a driving method thereof and a display device are provided. The display panel includes a pixel circuit and a light-emitting element, the pixel circuit including a driving transistor, a first reset transistor and a second reset transistor; the first reset transistor being connected with a gate electrode of the driving transistor and configured to reset the gate electrode of the driving transistor, and the second reset transistor being configured to reset the first electrode of the light-emitting element; a first initialization signal line, connected with the gate electrode of the driving transistor through the first reset transistor; and a second initialization signal line, connected with the first electrode of the light-emitting element through the second reset transistor. The first initialization signal line and the second initialization signal line are insulated from each other and are configured to supply signals respectively.