A molding device for molding an integral pulp-molded bottle, comprising a pulp suction system, an squeezing system, and a hot-press molding system, wherein the pulp suction system is configured to preliminarily form a wet bottle preform by a pulp grouting, and the pulp suction system is configured to mold, by a vacuum pumping, the wet bottle preform preliminarily formed by the pulp grouting followed by a pulp suction; the squeezing system is configured to form a premolded pulp-molded bottle by an inflating a first elastomer bag; and the hot-press molding system is configured to form an integral pulp-molded bottle by an inflating a second elastomer bag, the pulp suction system comprises a pulp grouting mold plate, a pulp grouting cavity, and a pulp suction mold plate, the pulp suction mold plate is provided with a cavity, wherein the cavity is the same as the integral pulp-molded bottle in shape; the pulp grouting mold plate is located above the cavity and the pulp grouting mold plate is connected to the pulp grouting cavity; wherein the pulp suction mold plate is provided with pulp suction holes and a pulp suction cavity; the pulp suction holes are formed in a peripheral surface of the cavity and the pulp suction holes communicate with the pulp suction cavity; and the pulp suction cavity is connected to a vacuum equipment to mold, by the vacuum pumping, the wet bottle preform preliminarily formed by the pulp grouting followed by the pulp suction. characterized in that the pulp grouting cavity has an extension portion, the extension portion is provided with pulp grouting orifices, the extension portion extends into the cavity of the pulp suction mold plate, and the wet bottle preform is preliminarily formed by grouting a pulp via the pulp grouting orifices. wherein the pulp suction system is configured to preliminarily form a wet bottle preform by a pulp grouting, and the pulp suction system is configured to mold, by a vacuum pumping, the wet bottle preform preliminarily formed by the pulp grouting followed by a pulp suction; the squeezing system is configured to form a premolded pulp-molded bottle by an inflating a first elastomer bag; and the hot-press molding system is configured to form an integral pulp-molded bottle by an inflating a second elastomer bag, the pulp suction system comprises a pulp grouting mold plate, a pulp grouting cavity, and a pulp suction mold plate, the pulp suction mold plate is provided with a cavity, wherein the cavity is the same as the integral pulp-molded bottle in shape; the pulp grouting mold plate is located above the cavity and the pulp grouting mold plate is connected to the pulp grouting cavity; wherein the pulp suction mold plate is provided with pulp suction holes and a pulp suction cavity; the pulp suction holes are formed in a peripheral surface of the cavity and the pulp suction holes communicate with the pulp suction cavity; and the pulp suction cavity is connected to a vacuum equipment to mold, by the vacuum pumping, the wet bottle preform preliminarily formed by the pulp grouting followed by the pulp suction. characterized in that the pulp grouting cavity has an extension portion, the extension portion is provided with pulp grouting orifices, the extension portion extends into the cavity of the pulp suction mold plate, and the wet bottle preform is preliminarily formed by grouting a pulp via the pulp grouting orifices.