The　present　invention　discloses　a　Si/Cu　composite　electrode　with　a　porous　structure　for　a　lithium　ion　battery　and　a　manufacturing　method　therefor.　The　composite　electrode　comprises　active　material,　　bulky　porous　Cu,　　and　a　current　collector.　The　active　material　Si　is　embedded　in　the　bulky　porous　Cu,　　and　the　bulky　porous　Cu　is　metallurgically　combined　with　the　current　collector,　　acting　as　both　a　binder　and　a　conductive　agent,　　alleviating　pulverization　and　shedding　of　the　active　Si　particles　and　improving　electron　transport　efficiency.　Moreover,　　the　porous　structure　increases　the　contact　area　between　the　active　Si　and　an　electrolyte,　　increasing　the　reaction　efficiency　of　lithium　intercalation.　The　manufacturing　method　for　the　composite　electrode　is　as　follows　:　　firstly,　　powder　metallurgy　and　diffusion　welding　technologies　are　adopted　to　prepare　a　Si-Cu-Al　precursor　alloy　on　a　Cu　current　collector　by　using　Si,　　Cu,　　and　Al　powders　as　raw　materials,　　and　then　removing　the　Al　element　in　the　Si-Cu-Al　precursor　alloy　by　utilizing　a　chemical　dealloying　method,　　so　as　to　obtain　a　Si/Cu　composite　electrode　with　a　porous　structure.