A fully enclosed plate filter is an efficient and hygienic solid-liquid separation device that uses multiple filter plates stacked together to form a closed filtration unit. Its core advantage lies in fully enclosed operation, which eliminates material leakage and external pollution, especially suitable for working conditions with high hygiene requirements or flammable, toxic, and irritating gases. This device has a large filtration area, high efficiency, low moisture content in the filter cake, and can be quickly loaded, unloaded, and cleaned through a quick opening structure, significantly reducing labor intensity. The precision filtration, clarification, decolorization and other processes widely used in industries such as chemical, pharmaceutical, food, and environmental protection are ideal choices for ensuring production safety and product quality.