To quantitatively illustrate the ammonia (NH₃) emissions from the cement industry in northern China, 14 cement lines were tested with 26 obtained NH₃ emission data, and the average NH₃ emission concentration was calculated as 35.29 mg/Nm³. The NH₃ emissions of 84.62% of cement lines were above the standard of 8 mg/Nm³. Factors affecting NH₃ emissions were analyzed; the ammonia injection amount in the selective non-catalytic reduction (SNCR) and the operation of raw mills were the main factors, and the NH₃ emissions increased as the amount of injected ammonia increased, while it decreased with the running of the raw mill. The average NH₃ emission factor (EF) was calculated as 0.07 kg NH₃/t clinker, which was higher than the official recommended data, meaning more attention should be paid to NH₃ emissions in the cement industry. Effective efforts should be made to prevent more NH₃ emissions.