Method for connecting nuclear component SiCf/SiC composite material pipe body and end plug

The embodiment of the invention provides a nuclear assembly SiCf/SiC composite material pipe body and end plug connecting method which comprises the steps that a SiCf/SiC composite material is used for preparing a pipe body, an opening is formed in the pipe body, and a first matching part is arranged at the opening; a SiCf/SiC composite material is used for preparing an end plug, the end plug is used for sealing the opening, a second matching piece is arranged on the end plug, and when the end plug is assembled on the pipe body, the first matching piece and the second matching piece are connected in a matched mode to form self-locking, so that the first connecting face of the pipe body abuts against the second connecting face of the end plug; arranging a metal layer for diffusion welding on the second connecting surface and/or the second connecting surface; the end plug is assembled on the pipe body, and the assembled end plug and the pipe body are placed in a vacuum diffusion welding cavity; a helium environ