Sealing box

The utility model discloses a sealing box, and creatively provides a double-layer sealing box body structure, so that the air tightness is further enhanced, a more strict leak-proof application scenecan be met, the air pressure of a second sealing cavity is greater than the air pressure of a first sealing cavity, and the air pressure of a second sealing cavity is greater than the air pressure ofa second sealing cavity. And it is further ensured that harmful substances in the first sealing cavity cannot leak outwards, and the safety is further improved. Besides, due to the fact that the volume of the second sealing cavity is small, the power of the needed air pressure control device is small, and the difference value between the P2 and the P1 is smaller than the difference value between the P1 and the air pressure outside the sealing box, so that the sealing effect is good. The power of the air pressure control device of the first sealing cavity can be selected to be smaller than thepower of the air pressure c