The invention discloses a desulfurization, denitrification and dust removal ultralow emission process and system for production of cement from low-sulfur raw materials. The process comprises the stepsas follows: firing of cement clinker, dust removal, flue gas blending, low-temperature SCR denitrification and wet desulfurization. The system comprises a cement clinker firing system, a kiln tail high-temperature fan, a grinding system, a kiln tail dust collector, a low-temperature SCR denitrification reactor, a wet desulfurization tower, a kiln head dust collector and a kiln head induced draftfan; a kiln tail preheater C1 gas outlet, the kiln tail high-temperature fan, the grinding system, the kiln tail dust collector, the low-temperature SCR denitrification reactor, the wet desulfurization tower, an exhaust fan and a kiln tail chimney are sequentially arranged; a cooler, a kiln head dust collector and the kiln head induced draft fan are sequentially connected; an outlet of the kiln head induced draft fan is connected with a gas outlet of the kiln tail dust collector. Dry desulfurization, SCR and wet desulfurization processes are adopted for production of cement from the low-sulfurraw materials, and desulfurization and denitrification ultralow emission during production of the cement from the low-sulfur raw materials is realized.