This　paper　investigates　the　axial　compressive　behavior　of　assembled　composite　wall　(ACW)　which　consists　of　a　double　steel　plate-concrete　composite　shear　wall　and　two　external　concrete　layers　on　both　sides.　29　ACW　specimens　and　4　double　steel　plate-concrete　composite　shear　wall　(DSCW)　specimens　were　tested　under　axial　load.　ACW　demonstrates　excellent　axial　compression　performance,　with　its　axial　compressive　strength　and　deformation　abilities　both　being　superior　to　DSCW.　Test　results　indicate　that:　i)　the　ratio　of　shear　connector　spacing-to-plate　thickness　(s/t)　s　/　t　)　has　a　significant　influence　on　the　axial　compressive　strength,　failure　mode　and　local　buckling　load　of　the　specimens;　ii)　the　external　concrete　layers　can　delay　the　local　buckling　of　the　steel　plates　and　enhance　the　axial　compressive　strength　of　the　composite　shear　wall.　The　impact　of　the　external　concrete　layers　on　the　axial　compressive　behavior　of　ACW　is　related　to　their　arrangement　form.　Finally,　three　different　codes　were　evaluated,　the　results　show　that　EC4　and　GB/T　51340-2018　calculation　results　match　well　with　the　test　results.