Dismounting device for gearbox gear

The invention discloses a dismounting device for a gearbox gear. The dismounting device comprises a bottom plate, a stand column, a cross beam, an oil cylinder and a lifting column with the adjustablelength; the bottom plate is connected to the cross beam through the stand column, the oil cylinder is connected to the cross beam in a sliding mode, a sliding locking device is arranged between the oil cylinder and the cross beam, the bottom plate is provided with a rotatable base, the base is provided with a plurality of T-shaped grooves distributed at equal intervals, and the T-shaped grooves are connected to the bottom of the lifting column through sliding nuts; the oil cylinder is further connected with a manual pump used for driving the oil cylinder to act; and the bottom plate is further provided with a locking device used for locking the base. According to the dismounting device for the gearbox gear, parts of different sizes can be supported, in addition, supporting of irregular parts can be met, in the pr