The invention relates to a vehicle monitoring method and a device thereof, aiming at providing a vehicle status monitoring method and an on-vehicle multimedia information terminal used for the method. The method comprises a main control unit sending the start signal to the video and audio input unit, a video and audio input unit and a GPS positioning unit collecting information, a wireless transmitting unit sending information and other steps. The terminal comprises an alarming inducting unit and the main control unit which are connected with each other. Besides, the terminal also comprises an identifying unit, a wireless transmitting unit, a GPS positioning unit, a video and audio input unit, a video and audio processing unit, a storing unit and a video and audio outputting unit, all of which are respectively connected with the main control unit. The invention realizes visual and rich alarming information, multiple alarming measures and multi media resources integration, and can be widely used in vehicle safety, on-vehicle communication, and on-vehicle multimedia play of the individual user and the vehicle monitoring of taxi companies and bus companies.