The invention relates to a method for rolling fine-grained
magnesium alloy with superplastic deformability. The method comprises the steps of low-rolling-reduction transverse rolling, high-rolling-reduction longitudinal asynchronous rolling, longitudinal reversed-direction rolling, low-temperature longitudinal rolling and annealing, and comprises the specific steps of heating a commercial
magnesium alloy blank in a heating box, standing to preserve heat for a period of time after heating to a preset temperature, firstly pushing the
magnesium alloy blank to an entrance of a rolling roller along the transverse direction, carrying out transverse rolling firstly, then, carrying out high-rolling-reduction longitudinal asynchronous rolling, then, carrying out longitudinal 180-degree-reversed rolling, then, carrying out low-temperature longitudinal rolling, and finally, carrying out low-temperature long-time annealing treatment or high-temperature short-time annealing treatment. According to the method,
cracking during the rolling of the
magnesium alloy can be reduced, the
crystal grain of the
magnesium alloy is refined, the texture is weakened, and the high-temperature
plasticity of the
magnesium alloy is improved; moreover, the process is simple and easy to operate, large-sized wide-width sheet materials can be prepared, and the
formability of the magnesium alloy is improved remarkably, so that the method is applicable to the
mass production of superplastic magnesium alloy and is prone to popularization and application.