The bearing puller is a device for taking out the inner bearing from the bearing seat, which is a kind of inner bearing puller, including mounting plate, tension bolt and through bolt; there are not less than two tension bolts, the bottom of each tension bolt has a claw which can catch the bottom of the inner bearing, each tension bolt is installed with a fastening nut, and the middle of the mounting plate has not less than one long hole The width of the long hole is larger than the diameter of the tension bolt. The lower end of each tension bolt passes through the long hole and extends to the lower part of the mounting plate. The fastening nut can be stuck on the mounting plate at the long hole. At least two positioning nuts are fixed on the mounting plate outside the long hole.