The invention discloses a power connector welding mechanism. The power connector welding mechanism comprises a rack (1), a first bearing board (21), a second bearing board (22), a first welding gun horizontal moving device (7) and a second welding gun horizontal moving device (8), and further comprises two sets of wire feeding devices. The first bearing board (21) and the second bearing board (22)are arranged on the rack. Polished power connectors and cable wire bodies which are subjected to branching treatment are automatically welded, so that the work efficiency is further improved, the labor cost is greatly reduced, the reliability of product quality is enhanced, and the work environment is improved.