Concrete prism damage test device and method in bending stress-chlorine salt-large temperature difference coupling environment

The invention discloses a concrete prism damage device and method for simulating and applying a bending stress-chlorine salt-large temperature difference coupling environment, and the device comprises a support, the upper end of the support is provided with a loading mechanism, the two opposite sides of the support are respectively provided with four adjusting mechanisms, the upper end of the support is provided with a chlorine salt supply part, and the two ends of the support are respectively provided with a limiting part. When the device is used for carrying out a load test, the concrete test piece can be limited, so that the test piece is prevented from moving during transfer. And when a load test is carried out, the load can be conveniently applied. According to the method provided by the invention, the simulation multi-field coupling damage test system can truly restore the damage state of concrete applied in the bending stress-chlorine salt-large temperature difference coupling process in a natural envi