Tail door hinge

The invention belongs to the technical field of hinges, and provides a tail door hinge which is composed of a left assembly and a right assembly in mirror symmetry with the left assembly, the left assembly or the right assembly comprises a sliding support, a fixed support and a rod end support, an arc guide groove is formed in the fixed support, and the sliding support is embedded in the inner side of the fixed support; the rod end support penetrates through the arc guide groove to be connected with the sliding support and limits the sliding support in the arc guide groove to slide in a guiding mode so that the tail door can be opened and closed. The concealed folding hinge has the advantages that the concealed folding hinge, the tail door and the machine body are seamlessly attached, the shape of the attached edge of the tail door and the machine body does not need to be changed, the structure is simple, 180-degree installation can be achieved without an additional support, meanwhile, 100-degree opening or a