Hidden hinge of aluminum alloy door

The utility model discloses a hidden hinge of an aluminum alloy door, which belongs to the technical field of hinges of aluminum alloy doors and comprises a hinge A and a hinge B. One side of the outer side wall of the hinge A is fixedly connected with a rotating ring A. Inner screw holes are formed in the inner sides of the surfaces of the hinge A and the hinge B, and outer screw holes are formedin the outer sides of the surfaces of the hinge A and the hinge B; the hinges are fixed through the screws in a staggered mode, the fixing stability of the hinges is improved, the zigzag triangular teeth at the bottoms of the hinge A and the hinge B can stably grasp a to-be-installed part in the installation process, friction force is increased, and therefore the hinges and the to-be-installed part are connected more stably and are not prone to shaking; the internal threads are formed in the inner side walls of the screw holes formed in the surfaces of the hinge A and the hinge B, and the screws are connected with th