A method for preparing drinking water for livestock includes mixing 2.5 to 5.0 WT % of tourmaline and 2.5 to 5.0 WT % of illite as natural minerals in powder form of 2 to 3 μm with 90 to 95 WT % of water to produce a mixed solution, and maintaining the mixed solution for 5 to 7 hours at room temperature, and removing the tourmaline powders and illite powders to produce leachate; mixing 15 to 25 WT % of detoxified sulfur in powder form of 2 to 3 μm, 10 to 25 WT % of Rrhus verniciflua Stokes extract, and 10 to 25 WT % of Momordicae Semen extract with 25 to 65 WT % of the leachate to produce a liquid mixture, and maintaining the liquid mixture for 12 hours; and mixing 150 to 250 ml of the liquid mixture with 20 l of water and maintaining the liquid mixture for 6 to 7 hours for amplification.