The invention discloses an experimental method for simulating the stress corrosion of a metal material under working conditions, belongs to the technical field of metal corrosion simulation, and solves the problem in the prior art that a sample device cannot truly simulate solution scouring in the working environment. The experimental method comprises the following steps: firstly, designing related experimental parameters according to the actual working environment; then respectively connecting a test piece to an upper loading part and a lower loading part through pins, mounting respectively corresponding nuts, adhering a strain gage to the center of the test piece, connecting the stress gage to a strain meter through a wire, loading load onto the test piece through the upper loading part and the lower loading part; finally, after loading a certain stress, taking down the strain gage, suspending a loading mechanism on a circular tray through a high-temperature-resistant cotton thread, placing the loading mechanism in a vessel body, and starting to do an experiment and record related data according to the conventional method. The experimental method can be used for testing related properties of the metal test piece which is corroded at high temperature and high pressure, such as the corrosion rate and the tensile property.