Thermosensitive printing head constant temperature protection device

The thermal printing head constant temperature protection device comprises an installation seat and a thermal printing head, the thermal printing head is fixedly installed on the installation seat, a data wire harness penetrating through the installation seat is arranged on the lower side of the thermal printing head, and a cover cap with a downward opening is fixedly installed at the upper end of the thermal printing head. The inner side of the cover cap is filled with heat conduction oil, a heating plate is arranged on the inner side of the cover cap, a plurality of electric heating rods are inserted into the upper end of the cover cap, the lower ends of the electric heating rods are fixedly connected with the heating plate in a welded mode, and the controller controls the electric heating rods to conduct heating, so that heat is rapidly conducted to the heat conduction oil through the heating plate. The thermal printing head is uniformly heated and insulated by the heat-conducting oil, so that the thermal