The present invention relates to a pelletizing device is formed as a field-driven straw harvester and is provided connected to a tractor (1) with shredder (2) by a diesel engine (7), which drives a power generator ( 13) and also an annular die press (9). the shredded straw arrives in a drying space (5) and, through a helical conveyor (8), arrives at the annular die press (9). Such annular die (17) on annular bearings (18) is supported on a base (19), on which a pair of rotary levers (20) are also articulated to a grinding cylinder (16). an electric drive motor (11) powered by the power generator (13) drives the helical conveyor (8) by a regulator (12) and servomotors (23), which engage the rotary levers (20), regulate the grinding column. the regulator (12) is driven by the need for diesel engine injection (7) or press pressure.
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