Uncapping device of sealed pot of sodium-cooled fast reactor breakage component

The invention discloses a device for opening a cover of a sealed tank of a faulty assembly of a sodium-cooled fast reactor. The device of the invention mainly comprises a driving mechanism, a grappling fixture body provided with a sliding chute which is matched with an upper bumper pin of a sealed cover, a mandril and a spring, wherein, the driving mechanism is connected on the grappling fixture body; the mandril is arranged in the interior of the grappling fixture body and movably connected with the grappling fixture body through the spring. The device of the invention has simple structure, convenient operation and safety and can run in a distant range.