Equal channel angular pressing (ECAP) is an effective and efficient severe plastic deformation (SPD) technique used to produce ultrafine grained (UFG) materials with improved properties. This review highlights a comprehensive summary of the mechanical property of various Mg-Li alloys subjected to ECAP processing, the effect of the processing parameters as well as the mechanism involved. This research can also provide directions and supports for the mechanical property improvement of Mg-Li alloys in the future.