The invention relates to a method for realizing low nitrogen combustion in a vertical flue of a coke oven combustion chamber. Preheated combustion supporting air enters the vertical flue from an combustion supporting air bottom outlet, then is mixed with exhaust gas, and then jets upward to be in contact combustion with lean gas/mixed gas erupted from a rich gas outlet or lean gas bottom outlet to form mild and deep hypoxic dilution combustion; along the height direction of the vertical flue, each section of combustion supporting air outlets and gas outlets are arranged in a staggered mode, so that there is always excessive combustion supporting air to react with low-concentration gas or excessive gas to react with oxygen-lean combustion supporting air in the combustion process to form a concentration deviation combustion process; the gas flow of each outlet is controlled by a flow adjusting device, and the last section of the combustion supporting air outlets is arranged higher than the last section of the gas outlets, so that there is a high temperature reduction area in the vertical flue, and in the high temperature reduction area, there is residual reduction gas capable of reducing generated NOx in high temperature exhaust gas. The method can effectively reduce the NOx concentration in the exhaust gas.