Lifting appliance, crane and lifting method

The invention discloses a lifting appliance, a crane and a lifting method, and belongs to the technical field of lifting equipment. The lifting appliance comprises a lifting beam, a connecting piece, a plurality of main-load lifting belts and a plurality of no-load lifting belts, the main-load lifting belts are connected to the lifting beam and a lifting plate, the main-load lifting belts are movably connected with the lifting beam so that the positions of the main-load lifting belts on the lifting beam can be adjusted, the no-load lifting belts are connected to the lifting beam and the lifting plate, at least one no-load lifting belt is detachably connected, and under the condition that the lifting plate is connected with a hoisting mechanism, the main-load lifting belts can be adjusted. And the lifting beam is lifted through the main load lifting belt or the no-load lifting belt. When the lifting appliance is used for lifting, the position of the main load lifting belt can be adaptively adjusted according t