Self-heating piston casting mold

The utility model provides a self-heating type piston casting mold which is applied to the field of engine manufacturing, positioning tables for supporting an insert ring are respectively arranged on the inner surfaces of a first outer mold and a second outer mold, and when the first outer mold and the second outer mold are mutually spliced to form an outer mold whole body, the positioning tables support the insert ring; the first outer mold and the second outer mold are each provided with a containing groove, an opening of each containing groove faces the outer wall, heaters can be placed in the containing grooves from the outer side, the heaters are made to be close to the positioning tables, the positioning tables are heated through the heaters, the positioning tables are kept at the high temperature, and the temperature reduction rate of the insert ring can be effectively reduced during casting; and finally, the risks of poor bonding of the inlaid ring and white spots under the ring are avoided. 本实用新型提供一种