The invention belongs to the field of material pelletizing moulding, and more specifically relates to a pelletizing mechanism, and a banded extruding pelletizing device. The pelletizing mechanism comprises a pelletizing unit, and a first blocking plate (27); the pelletizing unit comprises a cutter (25) and a driving equipment (20); the driving equipment (20) is connected with the cutter (25), andis used for driving the cutter (25) to move; the first blocking plate (27) is taken as a chopping block used in pelletizing process of the cutter (25). The banded extruding pelletizing device comprises the pelletizing mechanism and a banded extruding machine; the pelletizing mechanism is arranged at an outlet end of the banded extruding machine. The pelletizing mechanism is uniform in pelletizing,and excellent in versatility, can be used for different plastic materials, and is capable of realizing high efficiency high quality production of pellets using the banded extruding pelletizing deviceprovided with the pelletizing mechanism.