The invention discloses an antibacterial and ageing-resistant PE water supply pipe and a preparation method thereof and belongs to the technical field of water supply pipes. The antibacterial and ageing-resistant PE water supply pipe is prepared from the following raw materials in parts by weight: 30-50 parts of polyethylene raw material, 10-20 parts of glycerin triacetate, 1-2 parts of 2-mercaptobenzimidazole, 2-4 parts of sodium polyacrylate, 4-8 parts of N, N-bis(2-ethylhexyl)-2-benzothiazolyl sulfonamide, 2-8 parts of trinonyl phenyl phosphite, 3-9 parts of aminopropyltriethoxysilane, 2-8parts of ferrous sulfate, 1-3 parts of dispersant and 1-3 parts of antioxidant. The invention further discloses a preparation method of the antibacterial and ageing-resistant PE water supply pipe. Theantibacterial and ageing-resistant PE water supply pipe disclosed by the invention has a good antibacterial effect and a good ageing-resistant effect.