The present invention discloses a method and an apparatus for processing data of a multifunctional automobile charger by using a microprocessor. A main program module, an ignition current detection module, a charging current detection module, an internal battery constant current charging detection module, an internal battery temperature detection module, an output current detection module, a wireless charging failure detection module, a module for Bluetooth communication with a mobile phone and so on are loaded in a single chip microcomputer. Instructions of the modules are executed by a processor. The present invention provides an ignition function for an automobile, can communicate with a mobile phone, and is convenient to use.