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Food spoilage caused by bacterial growth is a serious threat to human health, so food preservation technology with long-acting antibacterial effect has been widely studied. In this work, (Cu 2 O-Ag)@TA heterojunction composite antibacterial material with a core-shell structure was synthesized to improve the stability of Cu 2 O. Morphological characterization shows that silver nanoparticles are uniformly distributed on the surface of Cu 2 O microspheres, (Cu 2 O-Ag) @TA has a core-shell structure, the particle size is about 300 nm, and the thickness of the tannic acid shell is about 6 nm. In addition, (Cu 2 O-Ag)@TA