Copper-based nanozymes are enzymatically active nanomaterials containing a certain proportion of copper. Copper-based nanozymes have attracted widespread attention and research from scientists because of their advantages of simple preparation, low cost, high activity, good stability and good biocompatibility. Currently, a large number of copper-based nanozymes have been developed and utilized. Utilizing their peroxidase-like activity and ability to generate free radicals, they can effectively kill tumor cells. In addition, copper-based nanozymes can catalyze the production of reactive oxygen species (ROS) in the bacteria to achieve effective sterilization.