The double membrane filter is used for liquid-based cytology tableting with a specific tableting machine. Double-layer filter, one layer is nylon filter to filter impurities, and the other layer is 8μm microfiltration membrane to ensure that cells are not filtered out and attached to the filter membrane. When the filter membrane is in contact with the glass slide again, a thin circular cell layer with a diameter of about 2 cm is formed at the defined position.