The invention discloses a metal material high temperature water vapor oxidation experiment device which has the advantages of convenient operation and control, reliable experimental data, high accuracy, etc. The device has the structure of comprising an argon supply device, an argon deoxygenator, a water vapor generator, an electric tube furnace and a reactor, wherein an outlet pipe of the argon supply device is connected with the argon deoxygenator, and an outlet pipe of the argon deoxygenator is connected with a water vapor outlet pipe of the water vapor generator and a water vapor inlet pipe of the reactor; the water vapor generator is provided with a water level automatic controller and is connected with a stable water supply device which is connected with the outlet pipe of the argondeoxygenator; the reactor is arranged inside a hearth of the electric tube furnace, the reactor is internally provided with a preheating tube, one end of which is connected with a water vapor inlet, and the other end thereof extends to the experiment section of the reactor.