The utility model discloses a cast screw operation tool, including upper cover, outer tube, interior pole, terminal transposition pole and glade clamp tie member, the upper cover is fixed in the outer tube, interior pole sets up in the outer tube with rotating, interior pole is fixed with terminal transposition pole, terminal transposition pole lower extreme forms oval post, the lateral wall of outer tube lower extreme is stretched to the evagination and is formed with connecting portion, the lateral wall of outer tube lower extreme is still seted up relative two and is dodged the hole, the glade clamp tie member sets up in the outer tube and overlaps on end transposition pole, the one end of glade clamp tie member is fixed with the outer tube, the other end branching of glade clamp tie member extends and forms the tight piece of double -phase right glade clamp, the terminal outside protruding tight head of clamp that forms centre gripping cast screw of the tight piece of glade clamp, press from both sides tight head and dodge the hole relatively, terminal transposition pole will press from both sides the play of the tight top of the head when rotating dodges the hole and outer or make in the tight first retraction outer tube of clamp. The utility model discloses the instrument can make the operator operate the cast screw at the distal end, avoids too being close to fuel assembly and receives great irradiation, improves the security.