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The application provides a modified activated carbon for removing perchlorate in water for sheep farms and a preparation method thereof, relates to the field of water treatment, and the method carries out reaction on activated carbon in a citric acid aqueous solution, uniformly loads a carboxyl layer on the surface of the activated carbon, and obtains preliminarily modified activated carbon; carries out reaction on the preliminarily modified activated carbon in an alkaline polydimethyl diallyl ammonium chloride aqueous solution, and strong cation quaternary ammonium salt is adsorbed on the surface of the carboxyl layer through electrostatic action, thereby obtaining secondarily modified activated carbon; and carries out reaction on the secondarily modified activated carbon in a triethylenetetramine aqueous solution, so that triethylenetetramine molecules are further combined to the strong cation quaternary ammonium salt through electrostatic adsorption, thereby obtaining the modified activated carbon for removing perchlorate in water for sheep farms, the adsorption capacity of the activated carbon for solutes with negative charges is significantly enhanced, and the treatment efficiency of the overall farm environment on perchlorate is improved.