The invention relates to a hinge structure. The hinge structure comprises a door framework half hinge, a door leaf half hinge, and a core shaft, wherein two end seat roll circular shaft holes are formed in the door framework half hinge; a middle seat roll circular shaft hole is formed in the door leaf half hinge; the core shaft sequentially penetrates through the end seat roll circular shaft hole,the middle seat roll circular shaft hole and the end seat roll circular shaft hole to hinge the door framework half hinge and the door leaf half hinge together; an outer shaft hole is formed in the outer side of the door framework half hinge, and the hole diameter of the outer shaft hole is greater than the hole diameter of the corresponding end seat roll circular shaft hole; the outer shaft holeand each end seat roll circular shaft hole form an entablature; the middle section of the core shaft is provided with a spiral oil groove; riveting holes are formed in both ends of the core shaft; the door leaf half hinge and the door framework half hinge are fixed by riveting the core shaft with the riveting holes in the two ends of the core shaft at the entablatures of the outer shaft holes ofthe two ends of the door framework half hinge. The hinge structure has the characteristics that the stress is uniform, the rotation is flexible, and the easiness in deformation is avoided.