The invention relates to a control method of a rolled steel oxidized iron sheet high temperature thermal deformation behavior. On the basis of a circular cylinder one-way compressive test by adoptinga thermal simulation experimental machine, the oxidized iron sheet deformation behavior is simulated in the hot rolling process at a production site by changing the shape of a specimen, and the control method of the rolled steel oxidized iron sheet high temperature thermal deformation behavior belongs to the technical field of steel rolling. The control method of the rolled steel oxidized iron sheet high temperature thermal deformation behavior comprises the steps that hot-rolled steel is machined to a cylindrical specimen, U-shaped grooves are cut at the two ends of the cylindrical specimen,and the groove bottom is grinded smooth. In the experimental process, machined specimen is placed between the two pressure heads of heat simulation, the specimen is heated to required temperature, heat preservation remains for certain time, thus the oxidized iron sheet is grown in the groove of the specimen, and then the specimen is compressed with different deformation volume. According to the control method of the rolled steel oxidized iron sheet high temperature thermal deformation behavior, space is provided for the growing of the oxidized iron sheet due to the fact that the shape of the specimen is improved, the deformation behavior of the oxidized iron sheet can be simulated in the hot rolling process, and the influence of the heating temperature and the deformation amount on plasticity of the oxidized iron sheet can be researched.