Pressure regulating device of plugging device

The pressure regulating device comprises a shell, a suction tube and an oxygen supply tube are fixedly connected to the bottom of the shell, a fixing block is fixedly connected to the top of the shell, a movable groove, a control cavity and a movable cavity are sequentially formed in the fixing block, a fixing column is fixedly connected to the top of the fixing block, and a connecting tube is further fixedly connected to the shell; the movable cavity is matched with a first-stage piston assembly, the movable groove is matched with a second-stage piston assembly, a transmission assembly is matched between the first-stage piston assembly and the second-stage piston assembly, the fixing column is matched with an adjusting assembly, and the adjusting assembly, the first-stage piston assembly, the second-stage piston assembly and the transmission assembly are matched to be used for controlling attraction force and oxygen supply pressure. The pressure regulating device is arranged to combine oxygen supply equipmen