In　order　to　achieve　widespread　application　of　surface-enhanced　Raman　spectroscopy　(SERS)　technique　for　practical　sensing　illegal　additives　in　food,　it　is　crucial　to　construct　a　reliable　SERS　substrate　that　offers　both　high　sensitivity　and　reusability.　This　work　utilized　a　simple　and　rapid　in-situ　deposition　method　to　deposit　Ag　nanoparticles　onto　hollow　Cu2O　nanospheres,　resulting　in　the　formation　of　Cu2O/Ag　nanocomposites　with　photocatalytic　and　SERS　properties.　These　nanocomposites　were　employed　as　a　hopeful　SERS　analysis　for　effective　sensing　of　colorant　additives　in　fruit　juice,　including　methylene　blue　(MB)　and　rhodamine　6G　(R6G).　Impressively,　the　nanocomposites　exhibited　an　exceptional　detection　limit　of　10-9　M　for　the　color　agents　and　demonstrated　a　strong　linear　relationship　between　SERS　intensities　and　the　logarithmic　concentration　(R2　＞=　0.95).　The　hollow　structure　of　Cu2O　provided　low　density　and　long-term　dispersion　stability　in　solution,　which　are　beneficial　for　real-time　monitoring　the　additives　in　liquid　food.　The　excellent　SERS　performance　can　be　attributed　to　the　electromagnetic　effect　of　Ag　metals　and　the　chemical　enhancement　of　Cu2O　semiconductors,　as　confirmed　by　the　N　1　s　XPS　spectra　from　MB.　Furthermore,　the　Cu2O/Ag　nanocomposites　efficiently　degraded　dye　molecules　under　UV　light　irradiation　within　a　short　period　of　45　min.　So,　the　nanocomposites　exhibited　practical　recyclability,　as　demonstrated　by　their　consistent　performance　over　five　cycles　of　SERS　sensing.　These　findings　highlight　their　significant　potent　for　SERS　sensing　trace　pollutants　and　ecological　restoration　by　photocatalytic　reaction　in　the　future.