The invention provides an oil and gas well integrity monitoring and management system which comprises an on-site well integrity data monitoring device and a well integrity data processing and analyzing system connected to the Internet. The on-site well integrity data monitoring device monitors to obtain relevant data, through the well integrity data processing and analyzing system, the well fieldmonitoring data provided by the on-site well integrity data monitoring device is displayed, analyzed and fed in real time, well historical data is stored, inquired and analyzed, and the oil and gas leakage risk alarm is achieved based on analysis and judgment results. The visualization of the whole process of well integrity management can be achieved, an integrity file of each oil and gas well isformed, the risk of oil and gas leakage can be proactively identified, the oil and gas well safety risk warning is dynamically carried out in real time, and high pressure can be automatically releasedespecially for an sustained casing pressure well.