The invention relates to an oxidation-resistant polyethylene drip-irrigation belt. The belt comprises carbon black, a PPA processing aid, a composite antioxidant, high-density polyethylene and linear low-density polyethylene, wherein the composite antioxidant is a mixture composed of an antioxidant B215, an UV absorber UV531 and low-density high-pressure polyethylene. The main component of the composite antioxidant used in the oxidation-resistant polyethylene drip-irrigation belt is an organic polymer material which has good oxidation resistance and good compatibility with a polyethylene polymer, so structural defects in preparation of the drip-irrigation belt are reduced; compared with common drip-irrigation belts, the drip-irrigation belt with the composite antioxidant in the invention has higher oxidation resistance; the composite antioxidant can prevent the side edges of the drip-irrigation belt from cracking during outdoor usage of the belt; and compared with common polyethylene drip-irrigation belt without any antioxidant, the composite antioxidant can improve the oxidation resistance of the drip-irrigation belt provided by the invention, ensure the service life of the drip-irrigation belt and reduce the possibility of damage to the drip-irrigation belt during usage of the drip-irrigation belt.