The deep purification project of artificial wetlands is an important technical means for upgrading and renovating the effluent of sewage treatment plants. The effluent from sewage treatment plants enters the artificial wetland and simulates the ecological function of natural wetlands. By utilizing the synergistic effect of substrate, plants, and microorganisms, residual pollutants such as COD, ammonia nitrogen, total phosphorus, suspended solids, etc. in the effluent are further removed, ensuring that the effluent quality meets the discharge standards.