Abstract: The effect of corrugated bending straightening process and aging on microstructure and mechanical properties of Mg-8.2 Gd-3.8 Y-1 Zn-0.4 Zr rare earth magnesium alloy thin plates was investigated. The results show that the bending and straightening process can lead to a significant increase in the number of deformed grains in the sheet metal, and as the deformation temperature increases, the number of deformed grains decreases. After subsequent aging treatment, the grain distribution of the plate do not change much, the basal texture strength increases, and the grain size increases. The decrease of KAM and GOS values leads to a significant improvement in mechanical properties. With the increase of insulation time, the tensile strength of rare earth magnesium alloy sheet shows a trend of first increasing and then decreasing. When the aging time is 52 h, the sheet has the highest tensile strength. After the above treatment, a rare earth magnesium alloy with a tensile strength of 515 MPa and a hardness of 143.5 HV can be prepared.