The invention discloses a voltage-resistant, arc-resistant and high-impact-resistant PC (Polycarbonate) / ABS (Acrylonitrile Butadiene Styrene) alloy. The PC / ABS alloy consists of an antioxidant B900, an ultraviolet absorbent UV329, a flexibilizer, a fire retardant HT-202M, an insulating agent 1, an insulating agent 2, ABS and PC. The voltage-resistant, arc-resistant and high-impact-resistant PC / ABS alloy has the excellent insulating properties of high impact resistance, wear resistance, high-voltage resistance, arc resistance and the like. The high-voltage resistance property of the product reaches 40MV / m, the arc resistance property reaches 535MV / m, and the surface resistivity is as high as 1019 ohm.m. The product cannot be easily broken down by high voltage and has excellent insulating properties. The voltage-resistant, arc-resistant and high impact-resistant PC / ABS alloy is particularly suitable for being applied to the manufacture of instrument and apparatus casings, aerospace vehicle interior trimmings, automobile interior trimmings, ship interior trimmings, electric appliance casings, exercise instruments and medical instruments.