Reference alignment device and alignment method for part with special-shaped end face

The invention relates to the technical field of machine manufacturing, in particular to a datum alignment device and alignment method for a welding part with a special-shaped end face. The alignment device comprises a first transfer tire fixedly connected with one end of the end face special-shaped welding part, a first adjusting unit fixedly connected with one end of the end face special-shaped welding part and the first transfer tire, and a second transfer tire fixedly connected with the other end of the end face special-shaped welding part. The second adjusting unit is fixedly connected with the other end of the end face special-shaped welding part and the second adapter tire; and the first adapter tire and the first adjusting unit are provided with connecting structures with adjustable intervals, so that the radial rotation angle of the first adapter tire is adjustable. The problem that in the prior art, a special-shaped end face welding part is difficult to fix is solved; meanwhile, compared with manual