This invention relates to a kind of no- halogen antiflaming polycarbonate / styryl resin composition, includes polycarbonate, flame retardant, antioxidant. It also incorporate phenol formaldehyde type ethoxyline resin; According to weight, polycarbonate takes 600 to 800 shares, styrene resin 50 to 300 shares, phenol formaldehyde type ethoxyline resin 20 to 100 shares, phosphonium flame retardant 40 to 90 shares, 2 to 5 shares phenol type main antioxidant and 2 to 4 shares assistance antioxidant. This product dose not discharge much noxious gas while burning.