A photovoltaic junction box, comprising: a box body; four terminals (210, 220, 230, 240) provided in the box body and comprising a first terminal directly connected to a positive wire directed into the box body and a second terminal adjacent to the first terminal; and three diodes (310, 320, 330) each mounted on adjacent terminals (210, 220, 230, 240), the diodes comprising a first diode mounted on the first and second terminals (210, 220), the first diode comprising a chip, a positive pin soldered on the first terminal and a negative pin soldered on the second terminal, wherein an area of a soldering bottom surface of the positive pin of the first diode soldered onto a surface of the first terminal is larger than that of a soldering bottom surface of the negative pin of the first diode soldered onto a surface of the second terminal, and wherein the chip of the first diode is directly electrically connected to the positive pin of the first diode, wherein each of the three diodes (310, 320, 330) in the photovoltaic junction box is configured as a surface mount type diode, wherein a third terminal is arranged adjacent to the second terminal; wherein an area of the third terminal is larger than that of the second terminal and wherein the diodes (310, 320, 330) further comprise a second diode mounted on the second terminal and the third terminal, wherein the second diode comprises a chip, a positive pin soldered on the second terminal and a negative pin soldered on the third terminal, and wherein an area of a soldering bottom surface of the positive pin of the second diode, which is soldered onto a surface of the second terminal, is less than an area of a soldering bottom surface of the negative pin of the second diode soldered onto a surface of the third terminal; and wherein the chip of the second diode is directly electrically connected to the negative pin of the second diode, wherein a fourth terminal is arranged adjacent to the third terminal; wherein the diodes (310, 320, 330) further comprise a third diode mounted on the third terminal and the fourth terminal; and wherein a negative wire directed into the box body is electrically connected to the fourth terminal, wherein the third diode comprises a chip, a positive pin soldered on the third terminal and a negative pin soldered on the fourth terminal; and wherein an area of a soldering bottom surface of the positive pin of the third diode, which is soldered onto a surface of the third terminal, is less than an area of a soldering bottom surface of the negative pin of the third diode, which is soldered onto a surface of the fourth terminal; and wherein the chip of the third diode is directly electrically connected to the negative pin of the third diode. a box body; four terminals (210, 220, 230, 240) provided in the box body and comprising a first terminal directly connected to a positive wire directed into the box body and a second terminal adjacent to the first terminal; and three diodes (310, 320, 330) each mounted on adjacent terminals (210, 220, 230, 240), the diodes comprising a first diode mounted on the first and second terminals (210, 220), the first diode comprising a chip, a positive pin soldered on the first terminal and a negative pin soldered on the second terminal, wherein an area of a soldering bottom surface of the positive pin of the first diode soldered onto a surface of the first terminal is larger than that of a soldering bottom surface of the negative pin of the first diode soldered onto a surface of the second terminal, and wherein the chip of the first diode is directly electrically connected to the positive pin of the first diode, wherein each of the three diodes (310, 320, 330) in the photovoltaic junction box is configured as a surface mount type diode, wherein a third terminal is arranged adjacent to the second terminal; wherein an area of the third terminal is larger than that of the second terminal and wherein the diodes (310, 320, 330) further comprise a second diode mounted on the second terminal and the third terminal, wherein the second diode comprises a chip, a positive pin soldered on the second terminal and a negative pin soldered on the third terminal, and wherein an area of a soldering bottom surface of the positive pin of the second diode, which is soldered onto a surface of the second terminal, is less than an area of a soldering bottom surface of the negative pin of the second diode soldered onto a surface of the third terminal; and wherein the chip of the second diode is directly electrically connected to the negative pin of the second diode, wherein a fourth terminal is arranged adjacent to the third terminal; wherein the diodes (310, 320, 330) further comprise a third diode mounted on the third terminal and the fourth terminal; and wherein a negative wire directed into the box body is electrically connected to the fourth terminal, wherein the third diode comprises a chip, a positive pin soldered on the third terminal and a negative pin soldered on the fourth terminal; and wherein an area of a soldering bottom surface of the positive pin of the third diode, which is soldered onto a surface of the third terminal, is less than an area of a soldering bottom surface of the negative pin of the third diode, which is soldered onto a surface of the fourth terminal; and wherein the chip of the third diode is directly electrically connected to the negative pin of the third diode.