With　the　continuous　improvement　of　people＇s　requirements　for　room　comfort,　fresh　air　system　has　gradually　become　an　indispensable　and　important　part　of　air　conditioning　system,　however,　the　energy　consumption　caused　by　fresh　air　system　cannot　be　ignored.　To　reduce　the　energy　consumption　of　fresh　air　system　and　improve　the　energy　utilization　rate,　a　modular　energy-saving　wall　with　two-stage　fresh　air　treatment　based　on　solar　energy　was　designed　in　this　paper.　The　design　was　based　on　solar　thin-film　photovoltaic　power　generation　technology,　and　the　battery　was　added　to　ensure　its　operation　durability.　At　the　same　time,　the　common　fresh　air　equipment　adopting　exhaust　heat　exchange　was　improved,　and　the　thermoelectric　refrigeration　heat　pump　system　was　added　to　realize　two-stage　treatment　of　fresh　air.　The　applicable　air　volume　range　of　the　device　was　60　-　90　m3　/　h,　fresh　air　cooling　was　used　in　summer,　the　supply　air　temperature　was　between　28　℃　and　31　℃,　and　the　sensible　heat　exchange　efficiency　could　reach　86.　7%　.　In　winter,　the　temperature　of　fresh　air　rose,　the　supply　air　temperature　was　between　12　℃　and　20　℃,　and　the　sensible　heat　exchange　efficiency　could　reach　79.　0%　.　Compared　with　the　primary　air　supply,　the　sensible　heat　exchange　efficiency　of　the　unit　increased　by　26%　-　28%,　which　realizes　the　deep　heat　recovery　of　fresh　air,　reduces　the　energy　consumption　of　air　conditioning　equipment,　and　achieves　the　energy-saving　effect　of　residential　air　conditioning　and　heating.　©　2023　Beijing　University　of　Technology.　All　rights　reserved.