External transformer of photovoltaic series welding machine

The utility model discloses an external transformer of a photovoltaic series welding machine, which relates to the field of transformer equipment, and comprises a transformer box, a winding mounting rack, a winding, a wire outlet plate, a circuit breaker and a terminal strip, a cross beam for fixing the winding mounting rack is arranged on the inner bottom surface of a box body of the transformer box, the winding is arranged in the transformer box through the winding mounting rack, and the circuit breaker is arranged in the transformer box. The two ends of the wire outlet plate are connected to installation ribs in a transformer box through bolts, the circuit breaker and the terminal strip are installed on the wire outlet plate and electrically connected with the winding through connecting lines, a heat dissipation air channel is formed in the winding, and the heat dissipation air channel is connected with the transformer box. According to the utility model, the I-shaped supporting strips arranged in the wind