Uranium oxide storage tank screw butt joint device and butt joint method

The invention discloses a butt joint device for screws of a uranium oxide storage tank, and relates to uranium conversion related equipment. A uranium oxide storage tank screw butt joint device comprises an outer conical cover, a lifting assembly, an inserting disc and an abutting assembly. A conical cavity and a square hole A which are communicated with each other are formed in the outer conical cover; the lifting assembly comprises an inner connecting seat and a nut A; the inner connecting seat comprises a square rod section, and a threaded rod section and a butt joint section which are fixedly connected to two ends of the square rod section; the inner connecting seat is movably inserted into the square hole A of the outer conical cover through the square rod section; the inserting disc comprises an inserting sleeve and a plurality of cantilevers fixedly connected to the outer wall of the inserting sleeve, and the inserting disc is movably inserted into the square rod section of the inner connecting seat th