The invention provides a grass crushing head multi-tier grass crushing machine and belongs to the field of agricultural machinery. According to the grass crushing head multi-tier grass crushing machine, a handrail is connected with a vehicle wheel frame, the vehicle wheel frame is connected with a machine head mechanism, a grass crushing rope is connected onto a grass crushing assembly at the front end of the machine head mechanism, vehicle wheels are connected onto the vehicle wheel frame, the grass crushing assembly comprises at least two mutually connected guiding disks, the two ends of at least one diameter of each guiding disk are provided with connecting holes respectively, torsion springs are connected with the guiding disks through the corresponding connecting holes, cams with gears are connected onto the torsion springs, the sides, with the gears, of the cams are close to the axis of a grass crushing head assembly and together with the axis forms rope penetrating grooves, and the grass crushing rope is connected into the rope penetrating grooves. The grass crushing head multi-tier grass crushing machine has the advantages that the functions are practical, the interior adopts the cam with the gears and the torsion springs to achieve the effect of rapidly installing and fixing the grass crushing rope, and the assembly and the disassembly are very convenient; the grass crushing head is of multi-tier design, the grass crushing rope can be installed in a multi-tier mode, and therefore the height of the grass crushing can be adjusted according to needs in grass crushing, and the practicability of the grass crushing machine is greatly improved.