Precise clamp of surface grinding machine

The utility model relates to the technical field of clamps, in particular to a precise clamp of a surface grinding machine, which comprises a mounting bottom plate, a fixed mounting hole is arranged at the edge of the top end of the mounting bottom plate, the top end of the mounting bottom plate is fixedly connected with a fixed base, and a fixed cavity is arranged inside the fixed base. By means of the movable screw rod, the connecting rotary disc, the movable clamping block, the connecting baffle, the first through hole and the second through hole, when the connecting rotary disc is rotated to drive the movable screw rod to rotate, the movable screw rod can be conveniently clamped by the movable clamping block when the movable screw rod is driven to rotate; and meanwhile, the fixed clamping block can move on the outer side of the surface of the movable screw rod, the top of the movable screw rod can be shielded through the connecting baffle plate, and chippings are prevented from falling on the outer side o