Mechanical test device and mechanical test method for providing high-temperature wet environment

The invention relates to the field of mechanical tests of large composite material structural members, in particular to a mechanical test device and a mechanical test method for providing a high-temperature wet environment. The mechanical test device comprises a base, a high-temperature and high-humidity environment box is arranged on the base, a heating assembly and a humidifying assembly are arranged in the high-temperature and high-humidity environment box, and the high-temperature and high-humidity environment box is made of a heat insulation material; detachable plugging blocks are arranged on the through holes of the high-temperature and high-humidity environment box; the examination area of the test piece is arranged in the high-temperature and high-humidity environment box, and the high-temperature and high-humidity environment box provides a high-temperature and high-humidity environment for the examination area. According to the mechanical test method, after a test piece is arranged on the mechanica