The invention relates to a gun type electric resistance welding transposition device. The gun type electric resistance welding transposition device comprises a gun type electric resistance welding gun, transposition positioning pins, a welding gun positioning seat, a positioning key, a transposition outer ring, a locking nut and a transposition inner ring, wherein the gun type electric resistance welding gun is fixed on the welding gun positioning seat, the welding gun positioning seat is installed in the transposition inner ring through the positioning key, the transposition inner ring is sleeved in the transposition outer ring, the transposition inner ring and the transposition outer ring are clamped by the locking nut, the transposition outer ring is fixed on a transposition outer ring fixing seat, the positioning pins are installed in the transposition outer ring, a plurality of positioning pin holes are formed in the transposition inner ring, and a certain positioning pin hole can be connected with the transposition positioning pins only by loosening the locking nut and rotating the transposition inner ring. Due to the fact that pin holes of different angles are formed in the transposition inner ring, the gun type electric resistance welding transposition device can achieve multiple-angle transposition of the gun type device welding gun. The gun type electric resistance welding and transposition device has the advantages of being simple in structure, convenient to use, rapid in transposition and alignment, capable of being used on solar battery welding automatic production, and excellent in effect.