The utility model provides a positioner of assistant measuring granulation cutter wearing and tearing volume, including a base plate the base plate coparallel is equipped with first locating plate and second locating plate, the second locating plate is a cascaded surface, place the district for a workpiece for measurement between first locating plate and the second locating plate, a locking Assembly, locking Assembly includes a locking hole and a locking positioning spare, locking the hole site in first locating plate, locking positioning spare is worn to establish the locking hole will the workpiece for measurement steps up to fix towards second locating plate direction. This positioner can make products according to interval size among the different parts width control, and it has a plurality of planar spare parts surface wearing and tearing volume to be suitable for the assistant measuring all kinds to having solved the different interplanars of spare part and apart from the measuring inaccuracy, having guaranteed measurement accuracy, reduced the error, this positioner is accurate, swift, convenient moreover.