The invention relates to an antibacterial nipple and a preparation method thereof. The antibacterial nipple is prepared from the raw materials in parts by weight: 100 parts of vinyl raw rubber, 0.5-1.5 parts of potassium chloride, 5-15 parts of konjac glucomannan, 2-5 parts of chitosan, 5-10 parts of carrageenan, 2-4 parts of xanthan gum, 5-9 parts of Gellan gum, 0.5-1 part of starch sodium phosphate, 15-28 parts of gaseous white carbon black, 0.5-1.2 parts of hydrogen containing silicone oil, 2.5-6 parts of hydroxy silicone oil, 0.2-0.5 part of sodium stearate, 0.01-0.05 part of platinum catalyst and 300-450 parts of water, through the steps of cooling and kneading, carrying out high-temperature melted warming, vacuumizing, adding silicone oil, milling, carrying out injection molding, carrying out vulcanization and the like. The antibacterial nipple has the advantages of high transparency and antibacterial property, good biocompatibility, biodegradability, flexibility, retentiveness, tensile strength, pull strength and tear strength, good demolding property and relatively long storage period.