Abstract: The denitrifying woodchip bioreactor utilizes woodchips and corn cobs as solid carbon sources, facilitating the conversion of dissolved NO₃^--N into nitrogen gas through the action of denitrifying microorganisms. This method is widely recognized for its effectiveness in reducing NO₃^--N levels. This paper reviews the various types, mechanisms, and performance outcomes associated with denitrifying woodchip bioreactors. It discusses the influence of carbon source, hydraulic residence time, temperature, and dissolved oxygen on nitrogen removal efficiency. Additionally, it summarizes secondary environmental impacts related to greenhouse gas emissions, sulfate reduction, and methylmercury production within these systems. Finally, this study explores potential improvements and expanded applications for denitrifying woodchip bioreactors. The findings presented herein provide valuable theoretical insights for optimizing their application in treating wastewater with high nitrogen concentrations.