Disclosed is a display panel, comprising a signal line, a test line for testing a signal line of the signal line, and a dummy line. The dummy line extends in a direction substantially consistent with that of the test line for preventing occurrence of electrostatic discharge on the test line. The test line and the dummy line have an overlapping region with the signal line, respectively, and the ratio of the area of the overlapping region between the dummy line and the signal line to the area of the dummy line is smaller than the ratio of the area of the overlapping region between the test line and the signal line to the area of the test line. A display device comprising the display panel is further disclosed.