The invention discloses a polycarbonate alloy. The polycarbonate alloy comprises the following components of 80 parts of polycarbonate and 5-30 parts of ethylene copolymer in parts by weight. The polycarbonate alloy disclosed by the invention has the advantages that the defects of poor polycarbonate molding and processing property, easily caused stress cracking of a product and the like are eliminated, the polycarbonate alloy possesses good processing performance, and stress cracking resistance is realized.