In　this　research,　we　fabricated　an　innovative　NiO/CN/Ag　composite　through　the　straightforward　electrostatic　assembly　of　Ag　nanoparticles　and　g-C3N4　sheets　onto　NiO　nanoflowers.　This　composite　enables　both　surface　enhanced　Raman　spectroscopy　(SERS)　detection　and　photo-degradation　of　pesticides.　The　results　reveal　NiO/CN/　Ag　can　quantitatively　detect　thiram　(TRM)　and　diquat　dibromide　(DQDB)　in　water,　with　a　limit　of　detection　(LOD)　of　10-9　M,　and　also　exhibit　outstanding　photo-degradation　efficiency,　exceeding　95　%　for　TRM　and　DQDB　within　90　min　under　simulated　sunlight.　Significantly,　after　the　organic　reagent　(citric　acid)　on　NiO/CN/Ag　was　completely　removed　through　simulated　solar　irradiation,　the　signal-to-noise　ratios　of　SERS　spectra　on　NiO/CN/　Ag　were　enhanced,　achieving　LODs　of　10-　8　M　for　TRM　and　DQDB　in　different　fruit　juices　and　dried　flower　teas.　Additionally,　the　composite　demonstrate　impressive　recyclability,　maintaining　robust　SERS　signals　and　high　degradation　rates　even　after　five　cycles　of　＂detection-degradation＂　processes.