A multi-frequency antenna is disclosed. The multi-frequency antenna is positioned on an electric device for transmitting Wi-Fi and Wimax wireless signals. The multi-frequency antenna comprises a radiating element, a grounding element and a connecting element. The radiating element comprises a first radiating area and a second radiating area, which are perpendicular to each other. The connecting element is connected to the second radiating area of the radiating element and the grounding element.