Abstract: The present invention relates to a mobile phone charger comprising a main device and connection cord. The main device is a transformer incorporating USB receptacle. A USB plug is provided in one end of the connection cord for plugging-in the USB receptacle of the main device; and a charger plug is provided in the other end of the connection cord. The present invention allows users to charge mobile phones when the connection cord connects to the main device. Users can also charge their mobile phones through household power sources, automobile power sources, computers and other power sources simultaneously when the connection cord connects to the main device.