The invention discloses a clamping mechanism of an end face grinder. The clamping mechanism comprises a grinder base, wherein a limiting rod is welded to the top of the grinder base; a lifting plate is slidably mounted on the outer side of the limiting rod; two L-shaped rods hinged to the top of the grinder base are arranged on one side of the limiting rod; the two L-shaped rods are symmetricallyarranged; the top ends of the two L-shaped rods are hinged to the bottom of the lifting plate; an operating table is welded to one side of the top of the grinder base; a first anti-skid rubber gasketis fixedly mounted on the top of the operating table; an end face grinding part is placed on the top of the first anti-skid rubber gasket; and the end face grinding part is located below the lifting plate. The clamping mechanism disclosed by the invention is high in practicality, simple in structure and convenient to operate, can adjust the distance between two second anti-skid rubber gaskets, andis convenient to move the second anti-skid rubber gaskets, so that the clamping mechanism can clamp end face grinding parts of different diameter lengths.