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This invention relates to the field of pulp molding technology, specifically to a wet pressing method for preparing plant fiber containers using high-pressure gas extrusion molding. This method employs high-pressure gas extrusion technology, combining precisely processed plant fiber boards with pulp to form containers with high strength and stability. The preparation process includes key steps such as precise processing of the plant fiber boards, pulp injection, compression, drying, and molding. During the pulp injection stage, a slow wire cutting machine ensures the molding die has an accuracy within 1 mil, and water holes are provided on the die to facilitate pulp entry and exit. During the compression stage, high-pressure compressed air rapidly expands the inner bladder, reducing the moisture content of the wet preform to approximately 70%, giving the container excellent strength and stability. The final product exhibits excellent tensile, flexural, and compressive strength. This container preparation method is widely applicable to applications requiring high strength and stability, providing reliable technical support for the preparation of environmentally friendly and high-performance containers.