The invention discloses a compression molding die with an automatic die closing mechanism. The compression molding die with the automatic die closing mechanism can conduct intermittent and stable die closing and comprises a male die and a female die located below the male die. A die cavity is formed when the male die and the female die are closed. A mold core is arranged in the die cavity. The compression molding die with the automatic die closing mechanism further comprises the automatic die closing mechanism. The automatic die closing mechanism comprises a horizontal guiding base which is provided with two guiding holes side by side. A vertical connecting rod is arranged in each guiding hole in a penetrating manner. A horizontal female die installing plate is fixed to the upper ends of the two connecting rods. The female die is fixed to the female die installing plate. An ejecting plate is fixed to the lower ends of the two connecting rods. A rotatable cam is arranged below the ejecting plate. The molded surface of the cam abuts against the lower plate face of the ejecting plate.