Packing box

A packing box, comprising:

• a base plate, having four edges including a first edge, a second edge, a third edge and a fourth edge;
• a first side plate, a second side plate, a third side plate, and a fourth side plate, respectively disposed on the first edge, the second edge, the third edge and the fourth edge of the base plate, wherein the first side plate is opposite to the second side plate, and the third side plate is opposite to the fourth side plate;
• a first cover plate, connected to the first side plate;
• a second cover plate, connected to the second side plate;
• a third cover plate, connected to the third side plate and having a first folding plate, wherein the first folding plate is adjacent to the first cover plate;
• and
• a fourth cover plate, connected to the fourth side plate and having a second folding plate, wherein the second folding plate is adjacent to the first cover plate;
• and
• when the first side plate, the second side plate, the third side plate, and the fourth side plate are folded relative to the base plate, the third cover plate is connected to the first cover plate through the first folding plate, and the fourth cover plate is connected to the first cover plate through the second folding plate,
• wherein the third cover plate and the fourth cover plate are in a wedge shape, the wedge shape has a pair of parallel sides, and the first folding plate and the second folding plate are respectively disposed on a long side of the pair of parallel sides,
• wherein the wedge shape further has an oblique side and a connecting side, the pair of parallel sides has the long side parallel to the first edge and a short side parallel to the second edge, the connecting side is connecting to a corresponding one of the third edge and the fourth edge of the base plate and connecting between the long side and the short side, and the oblique side is obliquely connecting between the long side and the short side opposite to the connecting side.