The utility model relates to a maintenance instrument for motor, including mobile base, jack, connecting plate, the jack sets up on mobile base, the connecting plate is equipped with the arch breach,the connecting plate is located mobile base's front end to rear end fixed stop with mobile base is connected through the lead screw, the front end of jack is connected with the connecting axle. The utility model is used for the wheel reel shaft of dismantlement installation motor holds, and this instrument simple structure has solved motor wheel reel shaft and has held dismantlement in -process yin lama troublesome poeration difficultly, needs many people coordinating operation's problem, has improved motor wheel reel shaft and has held dismantlement work efficiency (adopting 1 people of thisinstrument just can accomplish the operation), has reduced personnel labor intensity of construction, has improved operation safety coefficient.