The invention provides an MMD crusher tooth plate dismounting tool. The MMD crusher tooth plate dismounting tool comprises a bearing support, an input shaft, a driving gear, driven gears, spiral ejector rods, a supporting beam, a hinge mechanism and a grappler. The input shaft is put in the center of the bearing support, the spiral ejector rods are symmetrically put on the two sides of the bearingsupport, a hexagonal prism is arranged at the upper end of the input shaft, the lower end of the input shaft is connected with the driving gear through a key, the upper ends of the spiral ejector rods are connected with the driven gears through keys, threaded rods are arranged at the lower ends of the spiral ejector rods, symmetric threaded holes and hinge holes are formed in the supporting beam,the supporting beam can move up and down through the cooperation of the threaded rods at the lower ends of the spiral ejector rods and the threaded holes, a chain link at the upper end of the hinge mechanism is connected with the supporting beam through a pin shaft, a threaded rod is arranged on the upper portion of the grappler, connection with a U type hinge link at the lower end of the hinge mechanism is achieved through the cooperation with a nut, an inverted arch-shaped hook is arranged on the lower portion of the grappler, and a tooth plate can be effectively hooked. The structure is simple, the tooth plate can be more conveniently dismounted, potential safety hazards caused by a traditional dismounting method can be avoided, the labor intensity of workers is reduced, and the working efficiency is improved.