The invention discloses an insect-and-ant prevention polyethylene water supply tubular product and a preparation method thereof. The insect-and-ant prevention polyethylene water supply tubular product is prepared from the following raw materials in parts by weight: 40-60 parts of high density polyethylene, 20-40 parts of linear low density polyethylene, 15-25 parts of polyethylene naphthalate, 5-10 parts of nano aluminium phosphide, 10-15 parts of bis(2-ethylhexyl) terephthalate, 7-14 parts of naphthenic acid butyl ester, 2-3 parts of propyl gallate, 10-15 parts of steel slag micro powder, 8-16 parts of germanium powder, 15-20 parts of filling master batch, 3-6 parts of polyethylene wax, 2-4 parts of coconut monoethanol amide, 3-4 parts of polyamide wax micro powder, 2.5-4.5 parts of eucalyptus oil, 1.5-2.5 parts of 2-ethylhexyl diphenyl phosphate, 2-3 parts of dibasic lead stearate, 1-2 parts of di(beta-butoxy carbonyl-ethyl) tin bis(isooctyl mercaptoacetate), 1-2 parts of dichlorodiphenyltrichloroethane and 2-3 parts of benzyl benzoate. According to the invention, insect-and-ant prevention elements such as nano aluminium phosphide, eucalyptus oil and dichlorodiphenyltrichloroethane are added in the PE (polyethylene) water supply tubular product, so that the polyethylene water supply tubular product can be effectively prevented from being bitten by insects and ants; in addition, the prepared tubular product has excellent mechanical property, ageing resistance, heat resistance and processability, and is long in service life and wide in application prospect.