The invention relates to wire machining, and particularly relates to a metal wire machining system and method. The metal wire machining system comprises a supporting table, a shaft seat I, a shaft I,a driving limiting wheel, a groove I, a rod I, a belt wheel I, a motor I, a displacement frame, a shaft II and a driven wire wheel, wherein the driving limiting wheel can enable metal wires to be conveyed leftwards, and then the metal wires with different diameters can be conveyed. The metal wires can be directly extruded into a groove II conveniently, initial placement is facilitated, and the groove I and the groove II are combined for use so that the holding force for conveying the metal wires with the different diameters can be increased conveniently. Two rows of auxiliary wheels are utilized for limiting the front sides and the rear sides of the metal wires, and the accuracy and stability of conveying of the metal wires on the horizontal plane are improved. A base swings to change theconveying direction, staggered arrangement is matched, during swinging and direction changing, the metal wires are uniform in stress point distribution and easy to bend and reverse, and conveying is stable after reversing. A vertically-arranged guide mechanism stabilizes the upper sides and the lower sides of the metal wires, then the circumferential stress points are distributed in the long direction, and the metal wires with the different diameters are conveyed stably and accurately.