The utility model discloses a positioner for motor bearing gland belongs to the mechanical maintenance tool field. This positioner is including sliding connection's fixed part and movable part each other, and one of movable part is served and is provided with two at least movable vane, and two at least movable vane are shrink and cylindric around forming each other before positioner uses, and two at least movable vane strut through the fixed part after positioner passes the screw hole of motor bearing gland and describe around forming loudspeaker each other. The utility model provides a positioner for motor bearing gland can cooperate to remove through movable part and dead lever makes two to right the piece butt joint sternly, the one end of dead lever is the toper and the angle of inclination is 30, can become movable part one end that 8 partitions are umbelliform to strut, like this can be when the installation motor before in advance with the bearing, the back gland is fixed to solve and to be difficult to cause the time spent longer and influence work efficiency's problem owing to hold screw hole preceding, the back gland to positive axial.