The system monitors the entry and exit of vehicles in real time by installing a geomagnetic sensor under each parking space. When a vehicle is parked in a parking space, it will cause a disturbance in the local geomagnetic field. The geomagnetic sensor can sense this change and transmit this information to the management system in real time. The management system calculates the cost according to the parking time of the vehicle and the preset charging standard, and generates detailed billing records. At the same time, the system can also integrate the license plate recognition function, capture the license plate image through a high definition camera, and use image processing and pattern recognition technology for efficient identification to ensure the accuracy of vehicle information