The invention provides a vehicle-mounted voice system and method capable of achieving the secure car-shifting function. The system comprises a voice microphone, a call button and a mobile conversation device. The voice microphone and the call button are both connected to the outside of the car body of an automobile, and the call button and the voice microphone are in controlled connection. The mobile conversation device is in signal connection with the voice microphone. The system and the method can realize the secure car-shifting function, cannot display any information of the car owner in the process of contacting the car owner by a contact needing to move the car, and completely protect the user's information and privacy.