Engineering　nanostructures　for　semiconductor　materials　is　recognized　as　an　important　strategy　for　achieving　excellent　photocatalytic　activity.　Although　multiple　nanostructures　of　bismuth　oxychloride　(BiOCl)　were　reported,　their　synthesis　procedures　were　still　complicated　and　thus　limited　scalable　and　practical　photocatalytic　decomposition.　Here,　we　propose　a　highly　efficient　route　to　achieve　BiOCl　nanowires　through　simply　stirring　the　precursor　of　Bi2O3　powder　in　the　saturated　NaCl　solution　at　room　temperature.　The　concentration　of　NaCl　plays　a　crucial　role　in　growing　BiOCl　nanowires　under　the　mechanism　of　oriented　attachment,　uncovered　by　continuous　observations　of　product　morphologies　at　different　reaction　stages.　Compared　to　conventional　BiOCl　powder,　BiOCl　nanowires　exhibited　favorable　energy　band　structures　with　narrow　band　gaps,　which　are　predominated　by　the　unique　structure　with　a　high　aspect　ratio　and　exposed　active　{001}　facets.　A　superior　visible-light　photocatalytic　activity　for　degrading　Rhodamine　B　dye　was　found　in　the　case　of　the　prepared　BiOCl,　which　is　faster　than　that　for　BiOCl　nanoparticles　and　TiO2.