The invention relates to a cutting table grass returning device of silage harvesting machine. The cutting table grass returning device is characterized in that a grass returning device is added on the basis of two rotating tower wheels (1) of a cutting table. The cutting table grass returning device consists of a transmission device and rotating grass returning rollers (13), wherein the transmission device is provided with two gearboxes (6), a power rotating shaft is respectively connected with driving bevel gears (7) in two the gearboxes, the two driving bevel gears are respectively connected with a rotating flange shaft (9) through a driven bevel gear (5) engaged with the driving bevel gears, the rotating flange shaft is connected with the rotating grass returning rollers (13) through a flange, each rotating grass returning roller is provided with a grass returning roller mandrel (20), a flange (11), a reinforcing plate (10), multilayer fluted discs and roller teeth (19). The cutting table grass returning device has the advantages that through the mutually staggered installation of the fluted discs arranged on the two tower wheels arranged on the cutting table and the two rotating grass returning rollers, the rotating directions are opposite, field weed, fallen crops and the like can smoothly enter a feeding device of a silage machine, the machine halt due to cutting table blockage is avoided, and the operation efficiency of the silage machine is improved.