The double-layer filter cup is matched with a customized liquid-based cytology tableting machine for liquid-based cytology tableting. 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. There are 500 double-layer filter cups per carton.