A disposable packing box for scented tea comprises a box body, a box cover, a rotating mechanism and a fastening and sealing mechanism, wherein the rotating mechanism is arranged on the box cover; the fastening and sealing mechanism is arranged on the box body and is matched with the rotating mechanism; the rotating mechanism comprises a mounting hole, a sealing hole, a threaded hole, a rotating head, a double-screw bolt, a connecting column, a tip and a sealing ring; the mounting hole, the sealing hole and the threaded hole are formed in the box cover; the mounting hole communicates with the sealing hole by the threaded hole; the rotating head is arranged in the mounting hole; the double-screw bolt is connected with the rotating head; the connecting column is connected with the double-screw bolt; the tip is arranged at an end of the connecting column; and the sealing ring is arranged in the sealing hole and is used for sealing the connecting column. According to the packing box, a mode of connecting and fastening the box body and the box cover by gas extrusion is used instead of a traditional mode of connecting and fastening the box body and the box cover by a frictional force and an extrusion force between the box body and the box cover, once the packing box is used, the box body and the box cover cannot be combined again for packing unless the packing box is recycled, and therefore, lawless persons are prevented from selling seconds at best quality prices to make profits.