The utility model relates to a stator core fault detection auxiliary device's slide rail, including the same slide and bolt of a plurality of structures, a plurality of slides splice the formation slide rail each other, the center part at the both ends of slide is equipped with horizontal dovetail, the back is spliced with two adjacent slides mutually in the cross -section of bolt, and the slotted hole cross -section that the dovetail formed of two slides that correspond is the same, passes through between two adjacent slides the bolt splices in inserting the slotted hole that the dovetail formed, the middle part of dovetail is equipped with the counter bore, the axis of counter bore with the axis of slide is in on the same straight line, the center part of the both sides of bolt corresponds counter bore department is equipped with flexible round pin, the downthehole back of bolt insertion groove, the flexible round pin of the both sides of bolt are inserted in bolt both sides respectively.