MAGNESIUM ALLOY AND PREPARATION METHOD AND USE THEREOF

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A magnesium alloy and a preparation method and a use thereof. The magnesium alloy contains : 0.8-1.4 weight% of a rare earth element, 0.01-0.2 weight% of R, 0.8-1.5 weight% of Mn, 0-0.01 weight% of Fe, 0-0.01 weight% of Cu, 0-0.01 weight% of Ni, 0-0.01 weight% of Co, 0-0.01 weight% of Sn, 0-0.01 weight% of Ca and 96.84-98.39 weight% of Mg, wherein R is at least one selected from Al and Zn.