The invention provides an adjustable bearing assembling and disassembling tool and a using method thereof, relates to the field of bearing assembling and disassembling, and aims to solve the problemsthat an existing bearing assembling and disassembling tool is single in size of assembled and disassembled bearings, and the bearings are damaged. The provided adjustable bearing assembling and disassembling tool consists of two layers of pressure plates including an upper layer of clamping plates and a lower layer of clamping plates, the two layers of clamping plates are connected by connectors,and a fastening effect is achieved. The upper layer of clamping plates and the lower layer of clamping plates of the adjustable bearing assembling and disassembling tool slide relatively along a contact plane, and are locked at an optional position in a range according to the size of an inner ring of a disassembled bearing, after locking, a test shaft series is placed on a press or a correspondingworking table, pressure is applied to the shaft series to disassemble the bearing from the shaft series, and the adjustable bearing assembling and disassembling tool is mainly used for assembling anddisassembling bearings in an aviation bearing test process.