The invention relates to a desulfurization and denitrification integrated method for dry-process cement kiln flue gas and belongs to the technical field of smoke pollutant control of the cement industry. The method comprises the following steps: firstly drying rice husk ash and carbide slag for 12-24 hours at the temperature of 60-105 DEG C; then uniformly mixing the rice husk ash and the carbideslag in different volume ratio ((1-9):1); and finally removing SO2 and NOx at the same time by utilizing the rice husk ash and the carbide slag under the conditions that temperature is 800-900 DEG C and oxygen concentration is 1%-5%, wherein the carbide slag can be matched as a cement raw material, oxide ash in the rice husk ash also can be taken as an ingredient of cement, and performance of thecement cannot be influenced; meanwhile, Ca in the carbide slag also can promote a process of reducing nitrogen oxides with carbon during desulfurization, and the rice husk ash also provides a larger reaction space for desulfurization and denitrification while C is utilized for denitrification, so that reaction is more full. The integrated method provided by the invention has simple technology, lowadsorption material cost and high desulfurization and denitrification efficiency.