The present invention relates to an intelligent parking lot management system and its operating method, comprising a user terminal, a first license plate recognition module, a second license plate recognition module, a third license plate recognition module, a first display module, a voice prompt module, and a second display module , a warning module, a background server, and a wireless communication module; the user terminal is connected to the background server, and the first license plate recognition module, the second license plate recognition module, the third license plate recognition module, the first display module, and the second display module are respectively connected through the wireless communication module The background server, the second license plate recognition module, the voice prompt module, and the warning module are connected sequentially; the present invention integrates the traditional parking lot, utilizes the smart parking APP to realize data sharing with the parking lot background server in the city, and can update the parking information in real time , suitable for all kinds of large parking lots at present, and is conducive to the integration and unified management of the parking lots in the whole city.