Automatic annulus pressurization system and method

The invention provides an automatic annulus pressurization system and method.The system is provided with a pressurized material input end for providing materials used for being injected into a shaft annulus, the pressurized material input end is connected with the shaft annulus through a pressurization pipeline, and the pressurization pipeline is provided with a pressurization adjusting module used for adjusting the progress of injecting the pressurized materials; the real-time monitoring module is used for collecting real-time flow and pressure data of the pressurization pipeline before and after the pressurization adjusting module; an automatic control module decides a pressurization adjusting instruction according to real-time flow and pressure data of a pipeline before and after a pressurization adjusting module, staged pressurization is achieved, meanwhile, an early warning reminding module is arranged in the automatic control module, and when wellbore annulus pressurization state data meeting set early