Rapid demolding ejection mechanism of high-pressure casting machine and high-pressure casting machine

The invention relates to a high-pressure casting machine and a rapid demolding ejection mechanism of the high-pressure casting machine. The demolding oil cylinder is fixedly mounted on one side of the demolding plate; the demolding transition plate is mounted on the other side of the demolding plate in a relatively sliding manner through a guide rail; the positioning oil cylinder is used for driving the demolding transition plate to slide relative to the demolding plate; one end side of the mold demolding connecting rod is detachably locked on the demolding transition plate, the other end side of the mold demolding connecting rod is used for being connected with a mold to be demolded, and a plurality of through holes formed by communicating small hole parts and large hole parts are formed in the demolding transition plate; a head part of which the outer diameter is matched with that of the large hole part and a necking part of which the outer diameter is matched with that of the small hole part are adjacently