The invention provides an OLED display panel and an OLED display device. The OLED display panel comprises a first display area and a second display area corresponding to the arrangement position of an electronic element; the OLED display panel comprises a substrate, a driving circuit layer, a light-emitting layer, an optical coupling layer and a packaging layer; the driving circuit layer is arranged on one side of the substrate, the light-emitting layer is arranged on the side, away from the substrate, of the driving circuit layer, the optical coupling layer is arranged on the side, away from the driving circuit layer, of the light-emitting layer, the packaging layer is arranged on the side, away from the light-emitting layer, of the optical coupling layer, and in the second display area, the side, away from the driving circuit layer, of the light-emitting layer is provided with a light-transmitting enhancement layer. According to the OLED display panel, the light-transmitting enhancement layer is arranged on the light-emitting layer, so that the light-transmitting enhancement layer changes the resonance microcavity of the OLED display panel, the light transmittance of the OLED display panel is improved, and the shooting effect of the under-screen camera is improved.