NOVELTY - A dual stage sequencing batch reactor (SBR) carbon source urban wastewater denitrification device comprises nitrification and denitrification sequencing batch reactor (SBR1) (3), depth denitrification sequencing batch reactor (SBR2) (6), sludge fermentation sequencing batch reactor (SBRF) (11), raw water tank (1) with 1st feed pump (2) containing inlet which is connected to SBR1, storage tank (4) used to store nitrification liquid effluent, 2nd feed pump (5) which is connected to SBR2, 1st sludge pump (7), 2nd sludge pump (8), mud storage tank (9), and excess sludge feed pump (10).    USE - A dual stage sequencing batch reactor carbon source urban wastewater denitrification device (claimed).    ADVANTAGE - The device controls carbon/nitrogen ratio in urban wastewater, minimizes use of carbon, reduces production of excess sludge, and has simple structure.    DETAILED DESCRIPTION - A dual stage SBR carbon source urban wastewater denitrification device comprises SBR1 (3), SBR2 (6), SBRF (11), raw water tank (1) having 1st feed pump (2) containing inlet which is connected to SBR1, storage tank (4) which is used to store nitrification liquid effluent, 2nd feed pump (5) which is connected to SBR2, 1st sludge pump (7), 2nd sludge pump, mud storage tank (9), excess sludge feed pump (10), SBRF mixture feed pump (12), secondary settling tank (13) which operates based on the principle of gravity, water inflow feed tank (14) which is provided in secondary settling tank, sludge fermentation liquid feed pump (15) which is connected to SBR2, air compressor (16) which is connected to SBR1, 1st rotor flowmeter (17) which is installed in air compressor of SBR1, 1st stirrer (19), 1st dissolved oxygen (DO) meter (22), 2nd rotor flowmeter (18) which is connected to air compressor of SBR2, 2nd stirrer (20), DO meter (23), and 3rd stirrer (21) and pH meter (24) which are connected to SBRF.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of the dual stage sequencing batch reactor carbon source urban wastewater denitrification device.    Raw water tank (1)    1st feed pump (2)    Nitrification and denitrification sequencing batch reactor (3)    Storage tank (4)    2nd feed pump (5)    Depth denitrification sequencing batch reactor (6)    1st sludge pump (7)    2nd sludge pump (8)    Mud storage tank (9)    Excess sludge feed pump (10)    Sludge fermentation sequencing batch reactor (11)    Mixture feed pump (12)    Secondary settling tank (13)    Water inflow feed tank (14)    Sludge fermentation liquid feed pump (15)    Air compressor (16)    1st rotor flowmeter (17)    2nd rotor flowmeter (18)    1st stirrer (19)    2nd stirrer (20)    3rd stirrer (21)    1st dissolved oxygen meter (22)    Dissolved oxygen meter (23)    The pH meter (24)