Small packaging box

The utility model relates to the technical field of packaging boxes, in particular to a small packaging box which comprises a box body and a box cover, a connecting groove is formed in the lower end of the box cover, the box body is connected to the inner side of the connecting groove in an inserted mode, an equipment cavity and a cooling cavity are formed in the box body, cooling liquid is injected into the cooling cavity, and circuit elements are installed on the inner wall of the equipment cavity. And clamping grooves are symmetrically formed in the box body. The semiconductor chilling plate is used for refrigerating the cooling liquid, the cooled cooling liquid absorbs heat generated by the box body and the circuit elements, and the cooling liquid is matched with the heat dissipation grooves, so that the interior of the packaging box can be quickly cooled; and the box cover can be detached only by prying the clamping blocks to separate the clamping blocks from the clamping grooves, so that the interior of