The invention provides a high-efficiency low-NOx staged coupling combustion method for inferior coal, belongs to the technical field of high-efficiency clean coal combustion and aims to solve the problems that an existing coal combustion technology is incapable of simultaneously realizing low NOx emission and high combustion efficiency and needs to be provided with a coal grinding system during a combustion process of an inferior coal fuel. The high-efficiency low-NOx staged coupling combustion method provided by the invention is mainly composed of a fluidized bed and a pulverized coal furnace; the combustion process comprises the following steps: firstly, performing fuel-rich pyrolysis, adiabatic combustion, crushing, gasification and particle separation on coal particles in the fluidized bed; reforming the fuel into raw gas which is at a temperature of 850 to 900 DEG C and only contains particles of which the particle size is equal to or smaller than 75 micrometers; subsequently sending the raw gas to a combustor region of the pulverized coal furnace and performing fuel-rich combustion at the temperature of 1100 DEG C; finally performing fuel-lean after-combustion at the temperature of 1300 DEG C in the upper region of the combustor of the pulverized coal furnace, wherein the three stages of combustion are controlled relatively-independently and are effectively coupled by virtue of a new structure in the furnace. The method provided by the invention is mainly applied to the field of combustion of inferior coal.