Correction machine at front end of container

The invention provides a correction machine at the front end of a container. The correction machine comprises a rack, a lifting cross beam and a hydraulic cylinder. The lifting cross beam is arrangedon the rack in a manner of being capable of ascending and descending. A transverse guide rail is fixed to the lifting cross beam. The hydraulic cylinder is arranged on the lifting cross beam in a manner of being capable of transversely moving along the transverse guide rail. Thus, the hydraulic cylinder can be moved to any point in a plane range formed by the transverse range that the hydraulic cylinder moves along the transverse guide rail and the vertical range that the lifting cross beam ascends and descends. Then, the container is stopped at the correction position of the correction machine at the front end of the container, the front end face of the container and the movement plane of the hydraulic cylinder are parallel and meet a certain distance relation, the hydraulic cylinder canbe moved to the position r