In an anti-theft method for an automobile, each of NFC devices on the automobile is activated to detect corresponding induction coils when the automobile receives a preset door locking command. The method confirms a status of each of the plurality of doors according to detecting whether each of the NFC devices detects the corresponding induction coil, and further determines whether at least one of the doors of the automobile is opened abnormally according to the confirmed status of each of the doors. When at least one of the doors of the automobile is determined to be opened abnormally, the method controls an alarm unit of the automobile to output a preset warning.