The invention provides a method for treating domestic waste leachate tail water in an adsorption-coagulation way, belonging to the technical field of environment waste treatment. The method comprises the following steps of, firstly, biological treatment of domestic waste leachate; secondly, adsorption and decoloration treatment; thirdly, chemical coagulation treatment and the like. In the invention, by replacing granular activated carbon with powdery activated carbon and replacing a static filter process with quick stirring, under the synergism of adsorption and coagulation, the COD (ChemicalOxygen Demand) removal rate reach above 85 percent, the chroma is 40 times, and the effluent quality is good and reaches the national emission standard, thereby preventing the problems of blockage ofthe powdery activated carbon to a filter tank, floating residues in water and the like. The method is suitable for deep treatment of various domestic waste leachate tail waters.