The utility model discloses a clamping mechanism of agricultural mechanical handle, including the fixed column, with the fixed column be centre gripping cover that a body structure set up, nested set up the inside adapter sleeve of centre gripping cover and with adapter sleeve fixed connection's handrail body, a centre gripping cover side end has a cavity that sets up along the axis orientation, and cavity lower extreme equipartition sets up a plurality of threaded cavity, the threaded cavity upper end is the hemisphere, and this centre gripping cover inside has one and encircles the blotter that cavity side wall set up, the adapter sleeve is the U type along the cross -section of vertical direction, and the lower extreme is through a plurality of connecting pieces and centre gripping cover fixed connection that run through the setting. The utility model discloses in centre gripping cover and adapter sleeve have, can directly change the adapter sleeve after the wearing and tearing, do not need whole devices of changing, the connecting device who effectively avoids the during operation fastening that sets up of spin leads to the fact the whole centre gripping cover and the brute force of adapter sleeve to assault, the device still is provided with the blotter simultaneously, further reduces the impact force of centre gripping cover, and effective protecting clap holds the life of cover.