The present invention discloses a high weld line strength polyethylene/polycarbonate alloy, including the following components in parts by weight: 5 parts to 40 parts of a polyethylene; 40 parts to 85 parts of a polycarbonate; and 1 part to 15 parts of an ethylene copolymer compatibilizer. The high weld line strength polyethylene/polycarbonate alloy has the advantages of high weld line strength, a good melt index and a good thermal aging resistance.