Mg–Li–Al (LA143) alloys with high strength and plastic deformability were prepared through a combination of heat treatment and multi-directional forging in a channel die (MULTIDIRECTIONAL FORGINGC). The Vickers hardness of the alloy depended on the quenching temperature. As the applied equivalent strain was increased, the Vickers hardness and yield strength increased. The maximum specific yield strength of the Mg–Li–Al alloy in this study was 263 kN⋅m⋅kg-1 . The limit of reduction during cold rolling of all MULTIDIRECTIONAL FORGINGCed LA143 samples exceeded 99%. X-ray diffraction, field emission scanning electron microscopy, and energy-dispersive X-ray spectroscopy, revealed that the high specific yield strength could be attributed to severe plastic deformation as well as spinodal decompo sition of the body-centered cubic phase. Therefore, LA143 alloys with excellent mechanical properties can be prepared by heat treatment and severe plastic deformation.