Symmetrical machining milling cutter

The utility model relates to a symmetrical machining milling cutter comprising disc milling cutters. The symmetrical machining milling cutter is characterized by further comprising a cutter shaft and a locking nut. The middle part of the cutter shaft is sleeved with a spacing sleeve with the length equal to the distance between adjacent boundary lines of two symmetrical machining surfaces in the mode of clearance fit; the two disc milling cutters are arranged at two sides of the spacing sleeve by attaching to the end surface of the spacing sleeve and are locked respectively through fastening nuts connected with cutter shaft by threads; one end of the cutter shaft is clamped into a chuck of a lathe, and the other end thereof props against a center of the lathe; and the disc milling cutter is a three-edged disc milling cutter. The symmetrical machining milling cutter has the benefits of reference positioning by one time by adopting the symmetrical machining milling cutter to finish the simultaneous machining of the symmetrical structure of a workpiece, improvement of symmetry of the position machined, guarantee of product quality and appearance effect and improvement of production efficiency.