Gearbox power assembly, control method thereof and engineering machinery

The invention relates to the field of engineering machinery, and discloses a gearbox power assembly, a control method thereof and engineering machinery, the gearbox power assembly comprises a first sub-gearbox, a second sub-gearbox, a battery, an engine and a clutch, the first sub-gearbox is a planetary gearbox, and the second sub-gearbox is a fixed shaft gearbox. When gear shifting is carried out, only one of the first sub-gearbox and the second sub-gearbox is subjected to gear shifting, and the other one of the first sub-gearbox and the second sub-gearbox is kept unchanged at the current gear, so that when a motor in one sub-gearbox structure interrupts power in the gear shifting process, the first sub-gearbox structure and the second sub-gearbox structure are switched off. The peak torque of the motor in the other sub-gearbox structure can compensate the reduced torque of the motor in the sub-gearbox structure which is shifting, so that the power is not interrupted in the shifting process; and the first su