A connecting structure comprising: a connecting plate that has an abutting surface abutting with an electronic device and a fixing surface abutting with an adapter, a first fixing plate arranged at one end of the connecting plate, the first fixing plate protruding towards the electronic device from the abutting surface; and a second fixing plate arranged at the other end of the connecting plate, the second fixing plate protruding towards the electronic device from the abutting surface, wherein the second fixing plate is arranged opposite to the first fixing plate to define an accommodating slot for receiving an end of the electronic device having an interface. The connecting structure and the adapter reinforce the connection force between the plug and the interface, thus reducing the possibility of separation and preventing the plug from being broken.