The invention belongs to the technical field of fast neutron breeder reactors, and particularly relates to a machine hand used for assembling and disassembling a fast reactor loaded and unloaded material elevator bucket. The machine hand is provided with three tubular structural components including an outer sleeve, a middle sleeve and an inner sleeve from outside to inside respectively, and the key point is that: the lower end of the outer sleeve has a bulgy six-paw shape, and paws have inner inclined plane structures; the middle sleeve is shorter than the outer sleeve, the lower end of the middle sleeve has a circular groove shape, and the size of a circular groove is just suitable for clamping the top part of the bucket; and the length of the inner sleeve is longer than that of the outer sleeve, the lower end of the inner sleeve is provided with a regular hexagon cylindrical body, and the size of the regular hexagon cylindrical body is just suitable for the regular hexagon cylindrical body to extend into a regular hexagon hole formed on the inner side of the upper end of the bucket. The machine hand has the advantages of high reliability, high sealability, invisible operation in a distant range under the condition with strong radioactivity, strong corrosivity and high temperature, and the like.