The utility model discloses a container lid for spherical nucleus fuel element flask relates to hazardous articles transportation field, has solved the problem of the transportation of scarce specially adapted for spherical nucleus fuel element, shock resistance container lid high, easy processing again. The embodiment of the utility model provides a scheme does: with the supporting container lid that uses of spherical nucleus fuel element flask, the container lid is by the roof, goes up the lenticular cavity of bounding wall, flange, bounding wall, support ring, bottom plate I, interior bounding wall and bottom plate II welding formation down, the container lid passes through flange joint with shipping container, the inside packing of cavity that the welding of container lid formed there is "Cushion". The embodiment of the utility model provides a be applicable to radioactive substance transportation field.