Abstract: An overvoltage protection device connected between an AC plug and an electronic device, comprises a first AC pattern having first and second concave circular arc sections and a first peak point, a second AC pattern having third and fourth concave circular arc sections and a second peak point, and a frame ground pattern having a fifth concave circular arc section with the first peak point as a center and a sixth concave circular arc section with the second peak point as a center, both ends of the fifth concave circular arc section being located at centers of the first and second concave circular arc sections, and both ends of the sixth concave circular arc section being located at centers of the third and fourth concave circular arc sections. If an overvoltage is applied to any of the first and second AC patterns, a discharge occurs across any of the AC pattern and the frame ground pattern, allowing the overvoltage to escape to ground.