Device and method for testing corrosion integrity of cement sheath/plug under high-temperature and high-pressure carbon dioxide

A device and method for testing corrosion integrity of a cement sheath/plug under high-temperature and high-pressure carbon dioxide are characterized in that the device comprises an upper end cover, an inner cavity, the cement plug, a production sleeve, a through hole, an annulus, formation water with a fluorescent agent, the cement sheath, an intermediate sleeve, a water pipe, a first water bottle, a second water bottle and a gas bottle; the inner cavity and the annular space can maintain the cement paste to form a cement plug and a cement sheath respectively, so that the cement sheath and the cement plug are corroded at the same time in a high-temperature and high-pressure state, and the interface sealing integrity of the cement sheath and the cement plug is monitored in real time by adopting a bubble method; and measuring the radial corrosion depth and the axial corrosion depth of the cement sheath and the cement plug at different positions after corrosion by adopting a tracer method. The method is suitabl