Gear shifting control method and device of power assembly and vehicle

The invention relates to the technical field of vehicles, and particularly discloses a gear shifting control method and device of a power assembly and a vehicle. The control method comprises the steps that it is determined that a first gearbox is in a gear shifting state and a second gearbox is in a non-gear-shifting state or a torque returning process; when the first gearbox is in the twist clearing process, the required acceleration and the required torque of the vehicle are obtained; when the absolute value of the required acceleration exceeds a first set acceleration value, the output torque of the second motor assembly is gradually adjusted at a first set change rate until the output torque of the second motor assembly is equal to the value close to zero in the required torque of the vehicle and the maximum output torque of the second motor assembly; the output torque of the first motor assembly is equal to the difference value between the required torque of the vehicle and the actual output torque of th