This　study　proposes　a　novel　triple-steel　plate　composite　wall　(TSCW)　by　adding　an　intermediate　steel　plate　to　the　conventional　double-steel　plate　composite　wall　(DSCW)　configuration.　The　additional　steel　plate　enhances　the　confinement　effect　on　the　concrete　infill　and　allows　for　a　more　rational　redistribution　of　the　steel　content.　To　comprehensively　evaluate　the　structural　performance,　axial　compression　tests　were　performed　on　12　specimens　and　3　DSCW　specimens　to　evaluate　the　effects　of　spacing-to-thickness　ratio,　number　of　steel　plate　layers　and　steel　plate　thickness　on　structural　performance.　Finite　element　models　were　developed　and　validated　against　experimental　data.　Compared　to　the　experimental　program,　the　numerical　simulations　enabled　a　more　extensive　and　systematic　investigation　into　the　effects　of　the　spacing-to-thickness　ratio,　as　well　as　the　influences　of　steel　yield　strength　and　concrete　compressive　strength,　on　the　axial　behavior　of　the　composite　walls.　The　experimental　tests　and　finite　element　analyses　demonstrate　that:　i)　under　identical　steel　content,　the　axial　compressive　strength　of　TSCW　exceeds　that　of　DSCW;　ii)　increasing　the　thickness　of　the　intermediate　steel　plate　leads　to　a　more　significant　enhancement　in　the　axial　compressive　strength　compared　to　increasing　the　thickness　of　the　side　steel　plates;　iii)　reducing　the　spacing-to-thickness　ratio　effectively　enhances　the　axial　compressive　strength;　iv)　increasing　steel　yield　strength　or　concrete　compressive　strength　leads　to　significant　improvements　in　the　axial　compressive　strengths.　Based　on　these,　this　study　proposes　a　new　strength　equation　to　calculate　for　the　axial　compressive　strength　of　TSCW.