Sliding block groove mistake-proof clamp

The utility model provides a mistake-proof clamp for a sliding block groove. The utility model belongs to the technical field of milling jigs, the device comprises an airtight receiving disc, a push disc, an airtight body, a positioning disc, an expansion sleeve and a blind rivet, expansion sleeve is of a split structure, arrangement of at least two petals, a circular structure is defined by the two expansion sleeves; a workpiece is sleeved on the expansion sleeve; the lower end is arranged on the positioning disc; a mistake-proofing block is arranged on the positioning disc; the workpiece lower end notch corresponds to the error-proof block in position; the lower part of the expansion sleeve is fixedly connected with the push disc through a hexagon socket head cap screw; the middle of theairtight body is arranged between the expansion sleeve and the push disc and slidably connected with the expansion sleeve and the push disc, the upper portion of the airtight body extends upwards into the inner ring of the e