The invention relates to an integrated flue gas desulfurizing and denitrating purification system and a purification technology for the same, in particular to an integrated flue gas desulfurizing and denitrating purification system and purification technological processes for the same for coal firing industry. The integrated flue gas desulfurizing and denitrating purification system comprises a flue gas input system, a flue gas absorption and purification system, a purified flue gas exhaust system, a flue gas oxidizing system, a concentrating system, a slurry treatment system, a slurry oxidizing system and an absorbent delivery system, wherein the flue gas input system, the flue gas absorption and purification system and the purified flue gas exhaust system are mutually connected, the flue gas oxidizing system and the concentrating system are connected with the flue gas input system, the slurry treatment system is connected with the concentrating system, and the slurry oxidizing system and the absorbent delivery system are connected with the flue gas absorption and purification system. The purification technology is a comprehensive treatment technology including the processes of oxidizing flue gas, purifying and absorbing the oxidized flue gas and purifying after-products. The system is effectively integrated, simple, efficient and environment-friendly integrated flue gas desulfurization and denitration are realized, economic cost is greatly reduced correspondingly, and the purification technology is suitable for popularization and application in the field of purification and treatment of tail gas with sulfur and nitrogen oxides serving as main pollutants in coal firing boilers and other industries.