Aiming at the shortcomings that in vehicle condition diagnosis and anti-theft, an intelligent vehicle monitoring system with the functions of vehicle trouble diagnosis and anti-theft warning is designed. The system includes vehicle terminal, mobile App, cloud server. The vehicle terminal complies with various OBD-II standard protocols and has good compatibility. The terminal monitors the vehicle trouble in real time through the vehicle OBD interface, add detection and alarm functions to the original anti-theft system. Mobile App uses TCP/IP protocol to transmit information with vehicle terminal and cloud server to realize remote monitoring of the vehicle.