The invention discloses a vehicle rear-view monitoring alarm system and method based on multiple rotating zooming cameras, and the system comprises a rotating zooming device, an image collection module, an image collection module, an image processing and analysis module, a vehicle information extraction module, a warning prompt module, a warning module, and an auxiliary module. The invention discloses an alarm method employing the above alarm system. The system can monitor the regions at different distances behind a vehicle, can timely transmit the warning information to a driver under various conditions, achieves the classified warning, achieves the prompt in a highlighted manner under dangerous conditions, can effectively reduce the occurrence rate of traffic accidents, and protects the personal safety of persons and the safety of property in a vehicle.