This paper introduces the technological process of collaborative sludge disposal in cement kiln, and studies the dosage ratio of inorganic sludge and its influence on cement production energy consumption, flue gas emission and product quality. The practice shows that inorganic sludge can replace some high silica sandstone and clay by participating in the raw meal ratio according to the mixing amount of 2%. The power consumption of high-temperature fan at the kiln tail increases by 0.01kW·h/t, the power consumption of exhaust fan at the kiln preheater increases by 0.09kW·h/t, the emission of characteristic pollutants in flue gas does not increase significantly, and the chemical composition and product quality of cement clinker meet the requirements of relevant standards. The residue of inorganic sludge after calcination can be used as cement component and melted in cement clinker.