Heating ring of cubic press

The utility model relates to the technical field of top press heating rings, and discloses a heating ring of a cubic top press, the side surface of the heating ring is provided with a limiting edge, the upper surface of a polyhedral pressing cavity is provided with a mounting edge, the interiors of the two sides of the mounting edge are respectively provided with a mounting plate, the bottom of each mounting plate is provided with an extrusion ring, and the extrusion rings are connected with the limiting edge. Threaded rods are connected to the two sides between the extrusion ring and the mounting plate in a screwed mode. A threaded rod is rotated to drive an extrusion ring to move, the extrusion ring moves to extrude a limiting edge, and the extrusion ring can be limited through the threaded rod, so that the extrusion ring can stably limit the limiting edge, and the heating ring is stably mounted on the surface of a polyhedral pressing cavity; after being extruded, the heating ring does not generate counter-