Parking lot charging management method and system based on sound wave communication and mobile phone network

The invention discloses a parking lot charging management method and system based on sound wave communication and a mobile phone network, and the method comprises the steps: enabling an entrance camera to recognize the entrance of a vehicle, and extracting and storing entrance information; according to the Internet condition in the parking lot, selecting to send entrance information to the cloud platform or the exit camera, and after the Internet is disconnected, generating a first gate opening instruction code and a second gate opening instruction code in the exit camera and the cloud platform; when the exit camera recognizes that the vehicle leaves the parking lot, a payment mode is selected again according to the Internet condition, if the network is still disconnected, the exit camera calculates the fee, generates information, matches a verification code, sends verification information after the code is scanned by the mobile phone, verifies payment on the cloud platform, and then performs payment through