Filtering assembly, filtering device and filtering system

The utility model discloses a filtering assembly, a filtering device and a filtering system, the filtering assembly comprises a cylinder body, an inner framework, a filtering membrane and an end head, the cylinder body comprises an inlet area and an external connection area, the filtering device comprises a cylinder body and a shell, and the filtering system comprises the filtering device and a power device. Different aperture ratios are arranged in the external connection area and the inlet area of the cylinder body, so that the tolerance of the cylinder body is ensured, fluid residues in the filtering device are reduced, the fluid recovery rate is improved, and the cost is reduced; according to the utility model, the fixed bracket is additionally arranged on the shell, so that the filtering device is more stable and safer to place; according to the utility model, the structure of the insertion sheet at the end is improved, so that the filter assembly is more convenient to fix in the shell. The device is con