The utility model discloses an automatic retractor of special incision of bone surgery, including two mutual articulated scissors formula handles and locate two tooth locking devices between the handle handle position, and articulate and lead out device, its characterized in that two of two handle tip: lead out the somatic part that the device includes the neck and has two coupler bodies at least, the sidewise side of neck is 90 degrees right angle types, and its head end has a cylindricality and links the position, the tail end of somatic part articulates in this interlinkage position department, to there being a coupler body tip to be equipped with radial head portion on the somatic part, it has rational in infrastructurely, and is individualized strong, and convenient to use is efficient, reducible assistant and advantage such as with low costs.