Double-kettle test device and method suitable for high-temperature high-pressure water environment or steam environment

The invention relates to a double-kettle test device and method suitable for a high-temperature high-pressure water environment or a steam environment. The double-kettle test device comprises a largehigh-pressure reaction kettle and at least one small high-pressure reaction kettle arranged in a kettle cavity of the large kettle, the small high-pressure reaction kettle comprises a small kettle body and a small kettle cover, the small kettle cover covers the small kettle body, a small kettle cavity is formed in the small kettle body, and a test piece bracket for hanging a metal test piece is arranged in the small kettle cavity. When the double-kettle test device is used for carrying out a high-temperature high-pressure water environment coupon test, a plurality of groups of contrast tests can be conducted on the influence of different solutions (such as different solution concentrations) on the corrosion condition of a metal test piece at the same temperature simultaneously, so time andlabor are saved; and mean