NH₃ is one of the leading causes of grey haze, and one of the main causes of serious ecological imbalances that result in environmental problems such as acid rain and air quality deterioration. At present, excessive fertilizer application greatly intensifies NH₃ emissions intensity on farmland. In order to understand status and achievements of research on farmland NH₃ emissions, the literature of farmland NH₃ emission-related studies was retrieved from SCI journals and the Chinese science citation database. These are summarized with respect to the research progress on NH₃ emission factors and emission reduction technologies. The future research direction of field NH₃ emission and emission reduction technology need to strengthen the field observation on different soil environment and crop types, and understand the effect of NH₃ emission on fertilizer application period and the proportion, temperature and organic fertilizer management in farmland mainly. The research results can provide more information about the factors that influence NH₃ emissions. This study offers theoretical guidance and support directed at mitigating farmland NH₃ emissions in the future.