The present invention relates to a multi-functional vehicle charger and the charging process of the same. The vehicle charger includes an enclosure defining the vehicle charger. The enclosure includes a USB port disposed thereon, a power plug corresponding to a vehicle power outlet on one end, and a wire connected with a power terminal at the other end. The power terminal, the USB port, and the power plug are connected to a charge monitor circuit. Thus the vehicle charger can be connected with various electrical appliances for charging by insertion of the power terminal on the wire into a socket of a Li-ion battery and by a connecting wire that connects the USB port to electric appliances with USB functionality. Thereby, power is supplied by various output ends when the vehicle charger is inserted into a power outlet in vehicles.