The suspension is pumped into each closed filter chamber of the cardboard plate-frame filter. Under the action of pressure, the filtrate passes through the filter layer and filter cloth and is discharged through the filter cloth outlet, while the filter residue remains in the filter frame, thus achieving the purpose of solid-liquid separation. The filter frame and filter plate of the diatomaceous earth filter are sealed by cardboard or filter material. It is a stainless steel plate-frame precision filter (also known as stainless steel cardboard filter) with a relatively large filtration volume and a filtration area of more than 2m2. A cardboard fixing cross bar is configured below, which makes it easy to install and place the filter material. Using precision sterilized cardboard to filter various health wines and wines can achieve a sterilization effect.