A display panel and a testing method thereof, the display panel including a product region and a cutting region, and the product region including a display sub-region and a non-display sub-region. The display panel includes a flexible substrate, a thin film transistor layer, an organic light-emitting layer, a encapsulation layer, and a touch layer. The touch layer includes touch electrodes and touch leads. An end of each of the touch leads is connected to a corresponding touch electrode, the other end of each of the touch leads extends from the non-display sub-region to the cutting region, and a density of the touch leads in the cutting region is less than a density of the touch leads in the non-display sub-region.