The invention refers to a pelletizing device for cutting plastic strands into pellets having a cutting rotor (20) which is rotated by a drive system (22), and cutting blades (24) distributed over a circumference (26) of the cutting rotor (20) having cutting edges (78), root areas (44) of which cutting blades (24) are arranged in grooves (34) in the rotor body (20), each cutting blade (24) having a recess (46) parallel to the cutting edge (78), which recesses (46) are covered by one of the grooves (34) to receive and interact with one clamping device (48) being held in an opposite recess (42) in the rotor body (20), wherein each clamping device (48) comprises a radially extendable clamping sleeve (50) and a spreading device (58, 64, 70) to widen the clamping sleeve (50) at least radially with respect to the clamping sleeve (50). The invention is characterized in that only one clamping sleeve (50) per each cutting blade (24) is provided in the groove (34), said recess (46) of the cutting blade (24) extends from one flat end (80) of the cutting blade (24) at least close to the other flat end (81) of the cutting blade (24), said clamping sleeve (50) having an outer contour (52) which fits within the recess (46) in the cutting blade (24) and the opposite recess (42).