the present invention discloses a method for advanced treatment of bio - treated coking wastewater , belonging to the field of advanced treatment and recycled use of wastewater . it adopts polymeric ferric sulfate and polyacrylamide as the flocculant for pre - treatment of bio - treated effluent . after the process of precipitation and filtration , the effluent is guided through an adsorption column filled with environmentally - friendly nano - composites whereby the advanced treatment of the bio - treated coking wastewater is achieved . when the absorption process reaches the breakthrough point , the adsorption operation will be stopped and sodium hydroxide solution is used as the desorption reagent for regenerating the nano - composites ; the high - concentrated component of the desorption liquid is sent out for incineration or production of coal water slurry , meanwhile the low - concentrated component of the desorption liquid is used to prepare sodium hydroxid solution for the adsorption process of the next batch . the present invention features simple operating procedures and comparatively lower cost , and can be widely used in advanced treatment and comprehensive utilization of coking wastewater . it embodies not only significant environmental benefits but also promising market potential .