The ligand(SN-Br)was synthesized from salicylaldehyde，bromoethylamine hydrobromide，and 1-n-butylimidazole，and the cage-like silver complex［Ag4(PPh3)4Br4］was obtained by hydrothemal method.The structure of the target complex was confirmed by X-ray single crystal diffraction，energy spectrum analysis，thermogravimetric analysis and other analytical methods.The structure analysis shows that the target complex is the orthorhombic system and the space group is Pcnb.The unit cell parameters are a=18.208 nm，b=18.490 nm，c=21.117 nm，α=β=γ=90°，V=7 109.37 nm3，Z=24.Four Ag atoms and four triple bridged Br atoms are arranged alternately，each Ag atom is coordinated with three Br atoms，and further coordinated with the phosphine ligand to form a cage structure.The photocatalytic performance of the［Ag4(PPh3)4Br4］complex was tested.The degradation effect of the methyl orange solution under ultraviolet light is good，and the degradation rate is 96.8%.
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