The invention discloses a rotor part for a gear tooth type crusher, comprising a pair of roll shafts which are arranged in parallel and relatively rotate. A cluster of crushing teeth are respectively and axially installed on the outer surfaces of the pair of roll shafts at intervals, the crushing teeth comprises teeth and a hammer disc used for installing the teeth, the diameter of an inner hole of the hammer disc is matched with that of each roll shaft, four trapezoidal grooves used for installing the teeth are uniformly arranged on the radial outer surface of the hammer disc, and a wedged groove which is communicated with the trapezoidal groove is also arranged at one side of each trapezoidal groove; the lower parts of the teeth are inserted into the trapezoidal grooves of the hammer disc and are clamped by a wedge block which is clamped in each wedged groove; and the crushing teeth on the two roll shafts are installed at intervals through a plurality of partition discs. In the invention, the crushing teeth on the roll shafts can be conveniently changed after being worn, and because the crushing teeth are arranged at intervals through the partition discs, a larger occlusion space is formed so as to increase the usage range of the crusher.