Vehicle body end wall synthesis tool and process

The invention discloses a vehicle body end wall synthesis tool and a process. The vehicle body end wall synthesis tool comprises a tool platform, a supporting copper table and a pressing assembly, and an auxiliary electrode is arranged on the tool platform; the supporting copper table is arranged on the tool platform, used for loading an end wall auxiliary plate and an end wall assembly, and can form continuous surface support for a to-be-welded part between the end wall auxiliary plate and the end wall assembly; the supporting copper table is electrically connected with the auxiliary electrode; and the pressing assembly is arranged on the tool platform and used for pressing the end wall auxiliary plate and the end wall assembly on the tool platform. The tool is reasonable in structural design, and through the arrangement of the supporting copper table, the problems that in the prior art, due to the fact that part of end wall auxiliary plate faces are not supported, the flatness is poor, welding point indenta