Abstract: Aiming at the problems of high energy consumption and high emission in the cement industry, this study carried out an experimental study on oxy-hydrogen combustion in cement kiln with coal as fuel. By building a test platform, the effects of oxy-hydrogen combustion on the combustion characteristics, thermal parameters and pollutant emissions of cement kilns were systematically explored. The results show that oxy-hydrogen combustion can significantly improve combustion efficiency and reduce fuel consumption and CO_2 emissions. The carbon content of fly ash in the flue gas of kiln head oxy-hydrogen combustion is lower than that of air-hydrogen combustion. With the increase in oxygen concentration, the combustion efficiency of hydrogen-blended combustion is more ideal. The NOx concentration at the outlet of the precalciner is lower than that of conventional air combustion. This study provides a new technical path for clean and efficient production in the cement industry, which is of great significance to promote the green and low-carbon transformation of the industry.