NOVELTY - Synchronous nitrification, anaerobic ammonia oxidation and denitrification of granular sludge, comprises: (a) carrying out granular sludge nitrification by (a.i) adding 4 l anammox granular sludge into a sequencing batch reactor (SBR), where the particle size of granular sludge is 1-2 mm, and (a.ii) operating SBR at 30 degrees C by adding water, aerating and maintaining dissolved oxygen, stirring at 100 rotations/minute, precipitating, draining and allowing to stand; and (b) carrying out nitrification, anammox and denitrification of coupled denitrification granular sludge by same as mentioned above.    USE - The method is useful for synchronous nitrification, anaerobic ammonia oxidation and denitrification of granular sludge (claimed).    ADVANTAGE - The method: is environmentally friendly by restoring and regenerating water; solves the problem of low carbon nitrogen ratio, low efficiency and energy consumption of municipal sewage treatment; and achieves nitrification anammox and denitrification rate of more than 90%, total nitrogen removal rate of more than 80%, and total nitrogen removal volume load of 0.12 kg/m3.d.    DETAILED DESCRIPTION - Synchronous nitrification, anaerobic ammonia oxidation and denitrification of granular sludge, comprises: (a) carrying out granular sludge nitrification by (a.i) adding 4 l anammox granular sludge into a sequencing batch reactor (SBR), where the particle size of granular sludge is 1-2 mm with a concentration of 40 g/l, and (a.ii) operating SBR at 30 degrees C by adding water, aerating and maintaining dissolved oxygen at 4-8 mg/l, stirring at 100 rotations/minute, precipitating for 3 minutes, draining and allowing to stand, where the operation cycle is carried out for 8 hours; and (b) carrying out nitrification, anammox and denitrification of coupled denitrification granular sludge by (b.i) adding 4 l anammox granular sludge into a nitrification reactor, where the particle size of granular sludge is 1-2 mm with a concentration of 40 g/l, and (b.ii) operating nitrification reactor at 30 degrees C by adding water, aerating and maintaining dissolved oxygen at 0-1 mg/l, stirring at 100 rotations/minute, precipitating for 6 minutes, draining and allowing to stand, where the operation cycle is carried out for 9 hours, where the sewage ratio is 67%, and the sewage water is municipal domestic sewage having ammonia nitrogen concentration of 60-80 mg/l, nitrate nitrogen concentration of less than 1 mg/l, alkylene nitrogen concentration of less than 1 mg/l and chemical oxygen demand concentration of 160-250 mg/l.