Abstract: A cage type cyclone fine screen device having an overflow pipe (2), a feeding section (3), an undersized section (6), a conical section (7), a cage type screen (5) and an integrated cylindrical section (4). The cage screen is fixed by installing the upper and lower flanges respectively onto the upper end opening of the integrated cylindrical section and the upper end opening of the inner ring of the undersized section, resulting in convenience for assembly and disassembly. The device has the advantages of high processing capability, high classification efficiency, compactness, low investment, low power consumption, and long lifetime of the screen. This device is suitable for grading and concentrating aluminum hydroxide and other fine particles.