Forage grass seed harvesting mechanism

The invention discloses a forage grass seed harvesting mechanism which comprises a machine base, a harvesting wheel, a seed collecting groove and an air suction mechanism. The harvesting wheel comprises a middle part and further comprises a plurality of sets of seed picking assemblies arranged around the middle part, and each seed picking assembly comprises a plurality of fixed seed picking rods which are arranged in a scattered mode in the left-right direction and fixed relative to the middle part; the seed picking assembly further comprises a transverse rod capable of moving left and right relative to the middle part, and movable seed picking rods which are equal to the fixed seed picking rods in number and are in one-to-one correspondence with the fixed seed picking rods are fixed to the transverse rod; the transverse movement of the transverse rods can enable the fixed seed picking rods to be relatively attached to and relatively separated from the corresponding fixed seed picking rods; the forage grass s