Box-type fan shell connecting structure

The utility model relates to the field of box-type fans, and discloses a box-type fan shell connecting structure which comprises a mounting part, a ventilation opening is formed in one side of the mounting part in a penetrating mode, a box-type fan body is mounted at the position, close to the ventilation opening, of the outer surface of the mounting part, a connecting pipe is fixedly mounted in the middle of one side of the box-type fan body, and a fixing plate is integrally formed on the edge of one side of the connecting pipe; fixed guide rails are symmetrically welded to the two side portions of the fixed plate, limiting insertion rods are movably installed in the fixed guide rails, movable connecting rods are rotationally installed on the side portions of one ends of the limiting insertion rods, and a movable plate is rotationally installed between the two movable connecting rods on the same side; limiting screws are matched with limiting insertion rods to fix limiting blocks and limiting columns, so tha