Tire secondary vulcanization equipment without using enveloping sleeve

Tire secondary vulcanization equipment without using an enveloping sleeve comprises an annular hooping body with a U-shaped section, and the annular hooping body is an annular component with an opening or an annular component which is not provided with an opening but provided with a tensioning device or a plurality of combined annular components. At the opening, the plurality of mutually combined annular components are spliced and locked through a connecting device; the U-shaped bottom surface corresponds to the upper surface of the tread, and the two sides correspond to the side surfaces of the tread and the tire body; the curved surface of the U-shaped inner surface of the annular hooping body is directly or indirectly clung to the curved surface of the appearance of a tire crown and a tire body part of the tire, and is directly or indirectly sealed with the buffer rubber. The external tread side hooping device is used for replacing an enveloping sleeve structure to provide enough vulcanization pressure for