The invention discloses a segmented splicing type granulator hobbing cutter. The segmented splicing type granulator hobbing cutter comprises a cutter shaft and a plurality of hobbing cutter segments arranged on the outer side of the cutter shaft. Each hobbing cutter segment comprises a cutter ring, short blades detachably fixed to the outer wall of the cutter ring, and locking pieces used for fixing the short blades, wherein the locking pieces are provided with clamping parts, and the short blades are provided with limiting parts corresponding to the clamping parts. A plurality of cutter grooves distributed in the circumferential direction are formed in the outer wall of each cutter ring and axially penetrate the front surface and the rear surface of the corresponding cutter ring, locking holes for containing the locking pieces are formed in the front surface and the rear surface of each cutter ring, one side of each locking hole communicates with the corresponding cutter groove, and the short blades enter the cutter grooves through the clamping parts to be matched with the limiting parts to be detachably fixed into the cutter grooves. The multiple cutter rings penetrate through holes to be detachably connected with threaded holes in a screw joint manner through connecting bolts. The multiple short blades are connected to form long blades. According to the segmented splicing type granulator hobbing cutter, the blades are not prone to breaking, and the service life of the cutter is long; and meanwhile the single blades can be replaced, resource waste is avoided, and the using cost is reduced.