The mid-to-high latitude regions are sensitive to global climate change. In recent decades, the annual average temperature increase in these regions has been much higher than the global average temperature increase. Northeast China, located in the mid-to-high latitudes, is one of the concentrated distribution areas of wetland in China. The carbon and nitrogen cycling processes in these wetlands are extremely sensitive to climate change. Focusing on the wetlands in northeast China, we summarized and analyzed the impacts and mechanisms of temperature rise on greenhouse gas fluxes. We also reviewed the changes in the source and sink functions of greenhouse gases, and identified the current research gaps, and provided prospects for future research. Overall, temperature rise can lead to increased soil temperature, accelerated plant growth, enhanced microbial activity, and changes in soil physical and chemical properties, thereby affecting the absorption or emission of greenhouse gases in these wetlands. Additionally, temperature rise may cause the wetlands in northeast China to transition from a weak source to a strong source of CH₄ and from a sink to a source of CO₂, though there remains considerable uncertainty regarding changes in N₂O sources and sinks. Existing research on the wetlands of northeast China is not comprehensive enough, lacking long-term and high-frequency monitoring and studies on multi-gradient and multi-factor interactions. Future research should address these issues through comprehensive studies and analyses and further explore the mechanisms of mutual influence among different greenhouse gas flux changes.