A demolding mechanism of mold includes a male mold, a swingable block and an elastic element. The male mold defines a receiving groove therein. The swingable block mounted in the receiving groove of the male mold has a pressing arm and a shaping arm connected with the pressing arm. The shaping arm defines a shaping portion for shaping a part of a product to be molded in the mold. The elastic element is resiliently disposed between the bottom of the pressing arm of the swingable block and the male mold for causing the swingable block to swing, which makes the product be disengaged from the shaping portion of the swingable block.