A supporting device of a socket is located around a socket for supporting the electronic device and the transmission wire. When the plug located at the end of the transmission wire of the electronic device is plugged into the socket to connect with a power source or transmit data via the Internet, the supporting device of the present invention supports the electronic device to prevent the transmission wire and the plug from being pulled and dragged due to the electronic device being far away from the socket. The problem of the electronic device being damaged due to the electronic device being pulled and dragged is also overcome. The electronic device is protected and continues operating so that it can connect with a power source or transmit data via the Internet.