Printed circuit boards are the core components of electronic products,,mainly including precious metals,non-ferrous metals,heavy metals,brominated flame retardants and resins.The recycling of metal in waste circuit boards is not only conducive to the realization of resource recycling,but also reduces its harm to the environment.This paper outlines the technology of recovering metals from waste printed circuit boards,including mechanical processing technology,pyrometallurgical technology,hydrometallurgical technology and biometallurgical technology,and analyzes the advantages and disadvantages of different technology.In the future,biometallurgical technology has good application prospects in the treatment of waste printed circuit boards,and is expected to realize industrial applications,guarantee the low-cost,environment-friendly and efficient recycling of waste printed circuit boards,and solve the potential risks in the recycling process of waste circuit boards.