The invention relates to a device for realizing high-temperature steam oxidation and stress corrosion cracking tests simultaneously. A heating furnace (2) controls temperature, a stretcher applies load for a specimen (4), meanwhile, one way of high-temperature steam is introduced into the heating furnace (2) to provide a high-temperature steam oxidation corrosion environment, another way of high-temperature steam is sprayed to the specimen (4) through a steam spray pipe (7), so that the specimen (4) is in a high-temperature steam atmosphere completely, a constant current source (25) feeds direct current to the specimen (4), a nanovoltmeter (26) collects voltage drop signals generated through crack propagation at a notch and transmits the signals to a computer (27) for processing. The device can be used for realizing the high-temperature steam oxidation and stress corrosion cracking tests simultaneously, and the influence of joint action of high-temperature steam oxidation corrosion and stress on the crack propagation performance of a material is researched, so that the performance evolution law of the material in a service stage is revealed accurately.