The utility model discloses a cover clamp pick -and -place instrument in advance, the pick -and -place cover clamp in advance through connecting the pre -compaction handle, the pre -compaction is offering the in -line slot and lie in the screw of in -line slot on hand, cover clamp pick -and -place instrument in advance includes outer tube and interior pole, interior pole set up with rotating in in the outer tube, the upper end of interior pole makes progress out the outer tube upper end is provided with the operating portion, the lower extreme of outer tube have the in -line of being and with the grafting portion that the in -line slot corresponds, the lower extreme of interior pole is worn out downwards grafting portion is provided with the external screw thread. The grafting portion of the outer tube one end that the pole was equipped with the external screw thread in and respectively with in -line slot and screw cooperation, implementation tool and cover clamp's fastening connection in advance to can through the instrument the distal end that leaves reservoir to the operation that replaces of pre -compaction handle, it is regional that the messenger personnel keep away from high irradiation, thereby guarantee safety.