The photovoltaic junction box comprises a box body, a plurality of terminals disposed in the box body, and a plurality of diodes disposed in the box body. A first terminal of the plurality of terminals is directly connected to a positive wire extending into the box body and a second terminal of the plurality of terminals is disposed adjacent to the first terminal. A first diode of the plurality of diodes has a first positive pin with a first positive soldering surface soldered on the first terminal and a first negative pin with a first negative soldering surface soldered on the second terminal. The first positive soldering surface has a larger surface area than the first negative soldering surface.