The invention discloses a vehicle charging apparatus, and relates to the charging field of a battery pack. The vehicle charging apparatus comprises a detector, a voltage input unit, a voltage converter and an output unit, wherein the detector is used for detecting the actual electric quantity of an external vehicle-mounted device, and generating an instruction signal if the actual electric quantity is lower than a set rated electric quantity of the vehicle-mounted device; the voltage input unit is used for obtaining a voltage signal from the storage battery of the whole vehicle according to one instruction signal obtained by the detector; the voltage converter is used for generating a voltage signal compatible with the vehicle-mounted device according to the voltage signal obtained by the voltage input unit; and the output unit is used for providing a charging interface for the external vehicle-mounted device according to the voltage signal obtained by the voltage converter. The vehicle charging apparatus can be used for directly charging vehicle-mounted devices, such as a mobile phone, a PAD and the like without requiring to be transferred through transfer equipment and without depending on a cigar lighter system; and therefore, inconvenience caused by that a driver or a passenger does not take the transfer equipment or the vehicle-mounted device has no power can be avoided.