Car tail clamping ring structure of container car

The utility model provides a car tail clamping ring structure of a container car. The car tail clamping ring structure comprises a car body, a stretchable anti-collision steel beam, a clamping ring body, a first steel ball and a fixed screw. The anti-collision steel beam comprises a fixed rod and a movable rod, the fixed rod and the movable rod are fixed in an inserted and connected mode, the movable rod can vertically move along the fixed rod and is provided with three inserting holes, and the fixed rod is provided with a second steel ball matched with the inserting holes. The anti-collision steel beam is installed below the tail of the car body, the first steel ball is welded to the upper end of the clamping ring body and installed inside the car body, and the clamping ring body can perform 360-degree rotation. The fixed screw is screwed into the car body to be in contact with the first steel ball. The car tail clamping ring structure is simple in structure, the clamping ring body can perform 360-degree rot