The present invention discloses automatic mobile rotary shredder (17) having a guide unit with a pair of feeder guide (8), a cutting unit with pair of disc cutter (9), a chopping & shredding unit, a feeding unit to provide pressure and feed direction to the cut crops to enter into the chopping & shredding unit from the cutting unit a spring mechanism (12), a grinding wheel (13) and a depth control wheel (15). Said chopping and shredding unit consist of a fixed blade (14), a rotatable flywheel (24) and an exhaust spout (16). A plurality of hardened knives (10) and a plurality of pallets (11) are fitted on the periphery of said rotating flywheel. The crops that being cut by the cutters, enters into the chopping and shredding unit as directed by the pressure unit where the cut crops gets chopped and shredded by means of the flywheel (24).
